java复习资料.zip

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<link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/base.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/css/fancy.min.css" rel="stylesheet"/><link href="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89498988/raw.css" rel="stylesheet"/><div id="sidebar" style="display: none"><div id="outline"></div></div><div class="pf w0 h0" data-page-no="1" id="pf1"><div class="pc pc1 w0 h0"><img alt="" class="bi x0 y0 w1 h1" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89498988/bg1.jpg"/><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_"> </span><span class="ff2">第一章</span></div><div class="t m0 x1 h2 y2 ff1 fs0 fc0 sc0 ls0 ws0">1. java<span class="_"> </span><span class="ff2">语言的执行模式是：</span>( <span class="_ _0"> </span>C <span class="_ _1"> </span>)</div><div class="t m0 x2 h2 y3 ff1 fs0 fc0 sc0 ls0 ws0">A. <span class="_"> </span><span class="ff2">全编译型</span> <span class="_ _2"> </span>B. <span class="_"> </span><span class="ff2">全解释型</span></div><div class="t m0 x2 h2 y4 ff1 fs0 fc0 sc0 ls0 ws0">C. <span class="_"> </span><span class="ff2">半编译和半解释型</span> <span class="_ _3"> </span>D. <span class="_"> </span><span class="ff2">同脚本语言的解释模式</span></div><div class="t m0 x1 h2 y5 ff1 fs0 fc0 sc0 ls0 ws0">2. java<span class="_"> </span><span class="ff2">语言是<span class="_ _4"> </span></span>1995<span class="_"> </span><span class="ff2">年由（</span> <span class="_ _0"> </span>A <span class="_ _1"> </span><span class="ff2">）公司发布的</span></div><div class="t m0 x2 h3 y6 ff1 fs0 fc0 sc0 ls0 ws0">A. Sun <span class="_ _3"> </span>B. Microsoft <span class="_ _3"> </span>C. Borland <span class="_ _3"> </span>D. Fox Software</div><div class="t m0 x1 h2 y7 ff1 fs0 fc0 sc0 ls0 ws0">3. <span class="_"> </span><span class="ff2">下列不是虚拟机执行过程特点的是（</span> <span class="_ _1"> </span>A <span class="_"> </span><span class="ff2">）</span></div><div class="t m0 x2 h2 y8 ff1 fs0 fc0 sc0 ls0 ws0">A. <span class="_"> </span><span class="ff2">双线程</span> <span class="_ _3"> </span>B. <span class="_"> </span><span class="ff2">多线程<span class="_ _5"> </span></span>C. <span class="_"> </span><span class="ff2">动态链接<span class="_ _6"> </span></span>D. <span class="_"> </span><span class="ff2">异常处理</span></div><div class="t m0 x1 h2 y9 ff1 fs0 fc0 sc0 ls0 ws0">4. java<span class="_"> </span><span class="ff2">程序的执行过程中用到一套<span class="_ _4"> </span></span>JDK<span class="_"> </span><span class="ff2">工具，其中<span class="_ _4"> </span></span>javac.exe<span class="_"> </span><span class="ff2">指（</span> <span class="_"> </span>A <span class="_"> </span><span class="ff2">）</span></div><div class="t m0 x2 h2 ya ff1 fs0 fc0 sc0 ls0 ws0">A. java<span class="_"> </span><span class="ff2">语言编译器<span class="_ _7"> </span></span>B. java<span class="_"> </span><span class="ff2">字节码解释器</span></div><div class="t m0 x2 h2 yb ff1 fs0 fc0 sc0 ls0 ws0">C. java<span class="_"> </span><span class="ff2">文档生成器<span class="_ _8"> </span></span>D. java<span class="_"> </span><span class="ff2">类分解器</span></div><div class="t m0 x1 h2 yc ff1 fs0 fc0 sc0 ls0 ws0">5. <span class="_"> </span><span class="ff2">在当前的<span class="_ _4"> </span></span>java<span class="_"> </span><span class="ff2">实现中，每个编译单元就是一个以（</span> <span class="_ _1"> </span>A <span class="_ _1"> </span><span class="ff2">）为后缀的文件</span></div><div class="t m0 x2 h3 yd ff1 fs0 fc0 sc0 ls0 ws0">A. java<span class="_ _7"> </span>B. class<span class="_ _9"> </span>C. doc<span class="_ _a"> </span>D. exe</div><div class="t m0 x1 h2 ye ff1 fs0 fc0 sc0 ls0 ws0">6. <span class="_ _b"> </span><span class="ff2">每<span class="_ _c"></span>个<span class="_ _b"> </span></span>java<span class="_ _b"> </span><span class="ff2">的<span class="_ _c"></span>编<span class="_ _c"></span>译<span class="_ _c"></span>单<span class="_ _c"></span>元<span class="_ _c"></span>可<span class="_ _c"></span>包<span class="_ _c"></span>含<span class="_ _c"></span>多<span class="_ _c"></span>个<span class="_ _c"></span>类<span class="_ _c"></span>或<span class="_ _c"></span>界<span class="_ _c"></span>面<span class="_ _c"></span>，<span class="_ _c"></span>但<span class="_ _c"></span>是<span class="_ _c"></span>每<span class="_ _c"></span>个<span class="_ _c"></span>编<span class="_ _c"></span>译<span class="_ _c"></span>单<span class="_ _c"></span>元<span class="_ _c"></span>最<span class="_ _c"></span>多<span class="_ _c"></span>只<span class="_ _c"></span>能<span class="_ _c"></span>有</span></div><div class="t m0 x1 h2 yf ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">A</span>）类或者接口是公共的。</div><div class="t m0 x2 h2 y10 ff1 fs0 fc0 sc0 ls0 ws0">A. <span class="_"> </span><span class="ff2">一个<span class="_ _d"> </span></span>B. <span class="_"> </span><span class="ff2">两个<span class="_ _e"> </span></span>C. <span class="_"> </span><span class="ff2">四个<span class="_ _e"> </span></span>D. <span class="_"> </span><span class="ff2">任意多个</span></div><div class="t m0 x1 h2 y11 ff1 fs0 fc0 sc0 ls0 ws0">7. <span class="_"> </span><span class="ff2">下列选项中，不属于<span class="_ _4"> </span></span>Java<span class="_"> </span><span class="ff2">语言特点的一项是（</span> <span class="_"> </span>C <span class="_"> </span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x2 h2 y12 ff1 fs0 fc0 sc0 ls0 ws0">A. <span class="_"> </span><span class="ff2">分布式<span class="_ _10"> </span></span>B. <span class="_"> </span><span class="ff2">安全性</span></div><div class="t m0 x2 h2 y13 ff1 fs0 fc0 sc0 ls0 ws0">C. <span class="_"> </span><span class="ff2">编译执行<span class="_ _11"> </span></span>D. <span class="_"> </span><span class="ff2">面向对象</span></div><div class="t m0 x1 h2 y14 ff1 fs0 fc0 sc0 ls0 ws0">8<span class="ff2">．<span class="_ _c"></span>编译一个<span class="_ _c"></span>定义了<span class="_ _4"> </span></span>3<span class="_ _b"> </span><span class="ff2">个类和<span class="_ _4"> </span></span>10<span class="_ _b"> </span><span class="ff2">个方法<span class="_ _c"></span>的<span class="_ _4"> </span></span>Java<span class="_"> </span><span class="ff2">源文<span class="_ _c"></span>件后，会<span class="_ _c"></span>产生几个<span class="_ _c"></span>字节码文</span></div><div class="t m0 x1 h2 y15 ff2 fs0 fc0 sc0 ls0 ws0">件？扩展名是什么？（<span class="_ _1"> </span><span class="ff1">D<span class="_ _12"> </span></span>）</div><div class="t m0 x2 h2 y16 ff1 fs0 fc0 sc0 ls0 ws0">A. 13<span class="_"> </span><span class="ff2">个字节码文件，扩展名为</span>.class</div><div class="t m0 x2 h2 y17 ff1 fs0 fc0 sc0 ls0 ws0">B. 1<span class="_"> </span><span class="ff2">个字节码文件，扩展名为</span>.class</div><div class="t m0 x2 h2 y18 ff1 fs0 fc0 sc0 ls0 ws0">C. 3<span class="_"> </span><span class="ff2">个字节码文件，扩展名为</span>.java</div><div class="t m0 x2 h2 y19 ff1 fs0 fc0 sc0 ls0 ws0">D. 3<span class="_"> </span><span class="ff2">个字节码文件，扩展名为</span>.class</div><div class="t m0 x1 h2 y1a ff1 fs0 fc0 sc0 ls0 ws0">9. Java<span class="_"> </span><span class="ff2">语言属于（</span> <span class="_"> </span>B <span class="_"> </span><span class="ff2">）种语言？</span></div><div class="t m0 x2 h2 y1b ff1 fs0 fc0 sc0 ls0 ws0">A. <span class="_"> </span><span class="ff2">面向机器的语言<span class="_ _13"> </span></span>B. <span class="_"> </span><span class="ff2">面向对象的语言</span></div><div class="t m0 x2 h2 y1c ff1 fs0 fc0 sc0 ls0 ws0">C. <span class="_"> </span><span class="ff2">面向过程的语言<span class="_ _14"> </span></span>D. <span class="_"> </span><span class="ff2">面向操作系统的语言</span></div><div class="t m0 x1 h2 y1d ff1 fs0 fc0 sc0 ls0 ws0">10. <span class="_"> </span><span class="ff2">下列关于<span class="_ _4"> </span></span>Application<span class="_"> </span><span class="ff2">和<span class="_ _4"> </span></span>Applet<span class="_"> </span><span class="ff2">程序的说法中不正确的一项是（</span> <span class="_"> </span>B <span class="_"> </span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x2 h2 y1e ff1 fs0 fc0 sc0 ls0 ws0">A. Application<span class="_"> </span><span class="ff2">使用解释器<span class="_ _4"> </span></span>java.exe<span class="_ _15"> </span>B. Application<span class="_"> </span><span class="ff2">不使用独立的解释器</span></div><div class="t m0 x2 h2 y1f ff1 fs0 fc0 sc0 ls0 ws0">C. Applet<span class="_"> </span><span class="ff2">在浏览器中运行<span class="_ _16"> </span></span>D. <span class="_ _17"></span>Applet<span class="_ _18"> </span><span class="ff2">必<span class="_ _17"></span>须<span class="_ _17"></span>继<span class="_ _17"></span>承<span class="_ _18"> </span></span>Java<span class="_ _18"> </span><span class="ff2">的<span class="_ _18"> </span></span>Applet</div><div class="t m0 x1 h2 y20 ff2 fs0 fc0 sc0 ls0 ws0">类</div><div class="t m0 x1 h2 y21 ff1 fs0 fc0 sc0 ls0 ws0">11. <span class="_"> </span><span class="ff2">下列对<span class="_ _4"> </span></span>Java<span class="_"> </span><span class="ff2">语言的描述中，不正确的是（</span> <span class="_"> </span>A <span class="_"> </span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x2 h2 y22 ff1 fs0 fc0 sc0 ls0 ws0">A<span class="ff2">．不支持多线程</span></div><div class="t m0 x2 h2 y23 ff1 fs0 fc0 sc0 ls0 ws0">B. <span class="_"> </span><span class="ff2">一个<span class="_ _4"> </span></span>Java<span class="_"> </span><span class="ff2">源文件不允许有多个公共类</span></div><div class="t m0 x2 h2 y24 ff1 fs0 fc0 sc0 ls0 ws0">C. Java<span class="_"> </span><span class="ff2">通过接口支持多重继承</span></div><div class="t m0 x2 h2 y25 ff1 fs0 fc0 sc0 ls0 ws0">D. Java<span class="_"> </span><span class="ff2">程序分为<span class="_ _4"> </span></span>Application<span class="_"> </span><span class="ff2">和<span class="_ _4"> </span></span>Applet<span class="_"> </span><span class="ff2">两类</span></div><div class="t m0 x1 h2 y26 ff1 fs0 fc0 sc0 ls0 ws0">12. <span class="_"> </span><span class="ff2">一个<span class="_ _4"> </span></span>Java<span class="_"> </span><span class="ff2">源程序为<span class="_ _4"> </span></span>Test.java<span class="ff2">，编译该程序应该使用的命令为（</span> <span class="_"> </span>B <span class="_ _1"> </span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x2 h3 y27 ff1 fs0 fc0 sc0 ls0 ws0">A. javac Test <span class="_ _19"> </span>B. javac Test.java</div><div class="t m0 x2 h3 y28 ff1 fs0 fc0 sc0 ls0 ws0">C. java Test <span class="_ _1a"> </span>D. java Test.java</div></div><div class="pi" data-data='{"ctm":[1.611830,0.000000,0.000000,1.611830,0.000000,0.000000]}'></div></div><div id="pf2" class="pf w0 h0" data-page-no="2"><div class="pc pc2 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89498988/bg2.jpg"><div class="c x1 y29 w2 h4"><div class="t m0 x0 h5 y2a ff1 fs1 fc0 sc0 ls0 ws0">1.<span class="_ _1b"> </span><span class="ff2">下列<span class="_ _4"> </span></span>java<span class="_"> </span><span class="ff2">标识符，错误的是（<span class="_ _1b"> </span></span>D<span class="_ _1c"> </span><span class="ff2">）</span></div><div class="t m0 x3 h5 y2b ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>_sys_varl<span class="_ _9"> </span>B<span class="ff2">．</span>$<span class="_ _c"></span>c<span class="_ _1d"></span>han<span class="_ _c"></span>g<span class="_ _1d"></span>e<span class="_ _1e"> </span>C<span class="ff2">．</span>Use<span class="_ _1d"></span>r_<span class="_ _c"></span>name<span class="_ _1f"> </span>D<span class="ff2">．</span>1_file</div><div class="t m0 x0 h5 y2c ff1 fs1 fc0 sc0 ls0 ws0">2.<span class="_ _1b"> </span><span class="ff2">下列不属于简单数据类型的是（<span class="_"> </span></span>B<span class="_ _20"> </span><span class="ff2">）</span></div><div class="t m0 x3 h5 y2d ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．整数类型<span class="_ _21"> </span></span>B<span class="ff2">．类<span class="_ _22"> </span></span>C<span class="ff2">．符点数类型<span class="_ _23"> </span></span>D<span class="ff2">．布尔类型</span></div><div class="t m0 x0 h5 y2e ff1 fs1 fc0 sc0 ls0 ws0">3.<span class="_ _1b"> </span><span class="ff2">下列属于<span class="_ _4"> </span></span>JA<span class="_ _24"></span>V<span class="_ _25"></span>A<span class="_ _26"> </span><span class="ff2">关键词的是（<span class="_"> </span></span>C<span class="_ _20"> </span><span class="ff2">）</span></div><div class="t m0 x3 h5 y2f ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>TRUE<span class="_ _27"> </span>B<span class="ff2">．</span>g<span class="_ _1d"></span>o<span class="_ _c"></span>to<span class="_ _28"> </span>C<span class="ff2">．</span>flo<span class="_ _c"></span>a<span class="_ _1d"></span>t<span class="_ _29"> </span>D<span class="ff2">．</span>NULL</div><div class="t m0 x0 h5 y30 ff1 fs1 fc0 sc0 ls0 ws0">4.<span class="_"> </span>java<span class="_"> </span><span class="ff2">中，八进制数以</span>(<span class="_ _1c"> </span>B<span class="_ _20"> </span>)<span class="ff2">开头。</span></div><div class="t m0 x3 h5 y31 ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>0x<span class="_ _2a"> </span>B<span class="ff2">．</span>0<span class="_ _2b"> </span>C<span class="ff2">．</span>0X<span class="_ _2c"> </span>D<span class="ff2">．</span>08</div><div class="t m0 x0 h5 y32 ff1 fs1 fc0 sc0 ls0 ws0">5.<span class="_ _1b"> </span><span class="ff2">自定义类型转换是由按优先关系从低级数据转换为高级数据，优先次序为（<span class="_ _1c"> </span></span>A<span class="_ _2d"> </span><span class="ff2">）</span></div><div class="t m0 x3 h5 y33 ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>char-int-long<span class="_ _1d"></span>-flo<span class="_ _c"></span>a<span class="_ _1d"></span>t-d<span class="_ _c"></span>o<span class="_ _1d"></span>u<span class="_ _c"></span>b<span class="_ _1d"></span>le</div><div class="t m0 x3 h5 y34 ff1 fs1 fc0 sc0 ls0 ws0">B<span class="ff2">．</span>in<span class="_ _c"></span>t-l<span class="_ _24"></span>o<span class="_ _c"></span>n<span class="_ _1d"></span>g-float-d<span class="_ _c"></span>o<span class="_ _1d"></span>u<span class="_ _c"></span>b<span class="_ _24"></span>l<span class="_ _c"></span>e<span class="_ _1d"></span>-char</div><div class="t m0 x3 h5 y35 ff1 fs1 fc0 sc0 ls0 ws0">C<span class="ff2">．</span>lo<span class="_ _c"></span>n<span class="_ _1d"></span>g<span class="_ _1d"></span>-flo<span class="_ _c"></span>at-int-double<span class="_ _1d"></span>-char</div><div class="t m0 x3 h5 y36 ff1 fs1 fc0 sc0 ls0 ws0">D<span class="ff2">．以上都不对</span></div><div class="t m0 x0 h5 y37 ff1 fs1 fc0 sc0 ls0 ws0">6.<span class="_ _1b"> </span><span class="ff2">下列语句片断中，</span>fo<span class="_ _c"></span>u<span class="_ _24"></span>r<span class="_"> </span><span class="ff2">得值为：<span class="_ _2e"></span>（<span class="_"> </span><span class="ff1">D<span class="_ _1c"> </span></span>）</span></div><div class="t m0 x0 h6 y38 ff1 fs1 fc0 sc0 ls0 ws0">in<span class="_ _c"></span>t<span class="_ _26"> </span>th<span class="_ _c"></span>re<span class="_ _1d"></span>e=3<span class="_ _c"></span>;</div><div class="t m0 x0 h6 y39 ff1 fs1 fc0 sc0 ls0 ws0">char<span class="_"> </span>one<span class="_ _1d"></span>=<span class="_ _c"></span>‘1’</div><div class="t m0 x0 h6 y3a ff1 fs1 fc0 sc0 ls0 ws0">char<span class="_"> </span>four=(c<span class="_ _1d"></span>h<span class="_ _c"></span>a<span class="_ _1d"></span>r)(th<span class="_ _c"></span>ree<span class="_ _1d"></span>+o<span class="_ _c"></span>n<span class="_ _1d"></span>e);</div><div class="t m0 x3 h5 y3b ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>3<span class="_ _2f"> </span>B<span class="ff2">．</span>1<span class="_ _2b"> </span>C<span class="ff2">．<span class="_ _2e"></span><span class="ff3">‘<span class="ff1">3<span class="_ _1d"></span>1<span class="_ _c"></span><span class="ff3">’<span class="_ _1f"> </span></span>D<span class="ff2">．<span class="_ _2e"></span><span class="ff3">‘<span class="ff1">4</span>’</span></span></span></span></span></div><div class="t m0 x0 h5 y3c ff1 fs1 fc0 sc0 ls0 ws0">7.<span class="_ _1b"> </span><span class="ff2">下列不属于整型变量的类型是<span class="_"> </span>（</span>C<span class="ff2">）</span></div><div class="t m0 x3 h5 y3d ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>byte<span class="_ _28"> </span>B<span class="ff2">．</span>sh<span class="_ _c"></span>ort<span class="_ _21"> </span>C<span class="ff2">．</span>fl<span class="_ _c"></span>oat<span class="_ _30"> </span>D<span class="ff2">．</span>long</div><div class="t m0 x0 h5 y3e ff1 fs1 fc0 sc0 ls0 ws0">8.<span class="_"> </span>in<span class="_ _c"></span>t<span class="_ _26"> </span><span class="ff2">类型整型变量在内存中的位数为：<span class="_ _31"> </span></span>(<span class="_ _20"> </span>C<span class="_ _20"> </span>)</div><div class="t m0 x3 h5 y3f ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>8<span class="_ _2f"> </span>B<span class="ff2">．</span>16<span class="_ _22"> </span>C<span class="ff2">．</span>32<span class="_ _22"> </span>D<span class="ff2">．</span>64</div><div class="t m0 x0 h5 y40 ff1 fs1 fc0 sc0 ls0 ws0">9.<span class="_ _1b"> </span><span class="ff2">下列数据类型转换，必须进行强制类型转换的是：<span class="_ _2e"></span>（<span class="_"> </span><span class="ff1">D<span class="_ _1c"> </span></span>）</span></div><div class="t m0 x3 h5 y41 ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>byte<span class="ff2">→</span>int<span class="_ _32"> </span>B<span class="ff2">．</span>sho<span class="_ _c"></span>rt<span class="_ _24"></span><span class="ff2">→<span class="ff1">l<span class="_ _c"></span>ong<span class="_ _33"> </span>C</span>．<span class="ff1">flo<span class="_ _c"></span>a<span class="_ _1d"></span>t<span class="_ _1d"></span><span class="ff2">→<span class="ff1">d<span class="_ _c"></span>o<span class="_ _24"></span>u<span class="_ _c"></span>ble<span class="_ _34"> </span>D<span class="ff2">．</span>int<span class="ff2">→</span>c<span class="_ _1d"></span>h<span class="_ _c"></span>a<span class="_ _1d"></span>r</span></span></span></span></div><div class="t m0 x0 h5 y42 ff1 fs1 fc0 sc0 ls0 ws0">10.<span class="_"> </span>j<span class="_ _c"></span>a<span class="_ _1d"></span>v<span class="_ _c"></span>a<span class="_ _35"> </span><span class="ff2">中，用（<span class="_ _1c"> </span></span>A<span class="_ _18"> </span><span class="ff2">）关键字定义常量</span></div><div class="t m0 x3 h5 y43 ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>fin<span class="_ _c"></span>a<span class="_ _1d"></span>l<span class="_ _9"> </span>B<span class="ff2">．</span>#define<span class="_ _22"> </span>C<span class="ff2">．</span>flo<span class="_ _c"></span>a<span class="_ _1d"></span>t<span class="_ _30"> </span>D<span class="ff2">．</span>con<span class="_ _c"></span>st</div><div class="t m0 x0 h5 y44 ff1 fs1 fc0 sc0 ls0 ws0">11.<span class="_ _2d"> </span><span class="ff2">在<span class="_ _36"> </span></span>java<span class="_"> </span><span class="ff2">中语句：</span>37.2<span class="ff2">％</span>1<span class="_ _c"></span>0<span class="_ _26"> </span><span class="ff2">的运算结果为：<span class="_ _2e"></span>（<span class="_ _1c"> </span><span class="ff1">A<span class="_ _37"> </span></span>）</span></div><div class="t m0 x3 h6 y45 ff1 fs1 fc0 sc0 ls0 ws0">A.<span class="_"> </span>7<span class="_ _c"></span>.2<span class="_ _38"> </span>B.<span class="_ _1c"> </span>7<span class="_ _39"> </span>C.<span class="_"> </span>3<span class="_ _3a"> </span>D.<span class="_"> </span>0<span class="_ _c"></span>.2</div><div class="t m0 x0 h5 y46 ff1 fs1 fc0 sc0 ls0 ws0">12.<span class="_ _1b"> </span><span class="ff2">在<span class="_ _36"> </span></span>jav<span class="_ _c"></span>a<span class="_ _26"> </span><span class="ff2">语句中，位运算操作数只能为整型或（<span class="_ _31"> </span></span>B<span class="_ _1b"> </span><span class="ff2">）数据</span></div><div class="t m0 x3 h5 y47 ff1 fs1 fc0 sc0 ls0 ws0">A.<span class="_ _1b"> </span><span class="ff2">实型<span class="_ _28"> </span></span>B.<span class="_ _3b"> </span><span class="ff2">字符型<span class="_ _3c"> </span></span>C.<span class="_ _1b"> </span><span class="ff2">布尔型<span class="_ _3d"> </span></span>D.<span class="_ _1b"> </span><span class="ff2">字符串型</span></div><div class="t m0 x0 h5 y48 ff1 fs1 fc0 sc0 ls0 ws0">13.<span class="_ _1b"> </span><span class="ff2">下列（<span class="_ _1b"> </span></span>D<span class="_ _31"> </span><span class="ff2">）是合法的标识符？</span></div><div class="t m0 x3 h5 y49 ff1 fs1 fc0 sc0 ls0 ws0">A<span class="ff2">．</span>12cla<span class="_ _1d"></span>ss<span class="_ _19"> </span>B.<span class="_ _4"> </span>v<span class="_ _1d"></span>o<span class="_ _c"></span>id<span class="_ _a"> </span>C.<span class="_"> </span>-5<span class="_ _3e"> </span>D.<span class="_"> </span>_<span class="_ _c"></span>b<span class="_ _1d"></span>lank</div><div class="t m0 x0 h5 y4a ff1 fs1 fc0 sc0 ls0 ws0">14<span class="ff2">．下列（<span class="_ _31"> </span></span>B<span class="_ _2d"> </span><span class="ff2">）不是<span class="_ _36"> </span></span>Java<span class="_ _4"> </span><span class="ff2">中的保留字？</span></div><div class="t m0 x3 h6 y4b ff1 fs1 fc0 sc0 ls0 ws0">A.<span class="_"> </span>if<span class="_ _3f"> </span>B.<span class="_"> </span>sizeof<span class="_ _9"> </span>C.<span class="_ _36"> </span>priv<span class="_ _c"></span>a<span class="_ _1d"></span>te<span class="_ _40"> </span>D.<span class="_"> </span>n<span class="_ _c"></span>u<span class="_ _1d"></span>ll</div><div class="t m0 x0 h5 y4c ff1 fs1 fc0 sc0 ls0 ws0">15<span class="ff2">．下列（<span class="_ _31"> </span></span>C<span class="_ _2d"> </span><span class="ff2">）不是合法的标识符？</span></div><div class="t m0 x3 h6 y4d ff1 fs1 fc0 sc0 ls0 ws0">A.<span class="_"> </span>$<span class="_ _c"></span>mill<span class="_ _24"></span>i<span class="_ _c"></span>on<span class="_ _19"> </span>B.<span class="_"> </span>$_mill<span class="_ _c"></span>io<span class="_ _1d"></span>n<span class="_ _41"> </span>C.<span class="_"> </span>2$_millio<span class="_ _c"></span>n<span class="_ _42"> </span>D.<span class="_"> </span>$<span class="_ _c"></span>2<span class="_ _1d"></span>_<span class="_ _c"></span>m<span class="_ _1d"></span>illion</div><div class="t m0 x0 h5 y4e ff1 fs1 fc0 sc0 ls0 ws0">16<span class="ff2">．下列选项中，<span class="_ _2e"></span>（<span class="_ _2d"> </span><span class="ff1">B<span class="_ _31"> </span></span>）不属于<span class="_ _36"> </span><span class="ff1">Java<span class="_ _35"> </span></span>语言的基本数据类型？</span></div><div class="t m0 x3 h5 y4f ff1 fs1 fc0 sc0 ls0 ws0">A.<span class="_ _1b"> </span><span class="ff2">整数型<span class="_ _33"> </span></span>B.<span class="_ _31"> </span><span class="ff2">数组<span class="_ _28"> </span></span>C.<span class="_ _31"> </span><span class="ff2">浮点型<span class="_ _3d"> </span></span>D<span class="_ _1d"></span>.<span class="_ _31"> </span><span class="ff2">字符型</span></div><div class="t m0 x0 h5 y50 ff1 fs1 fc0 sc0 ls0 ws0">17<span class="ff2">．下列关于基本数据类型的说法中，不正确的一项是（<span class="_ _31"> </span></span>D<span class="_ _2d"> </span><span class="ff2">）<span class="_ _2e"></span>。</span></div><div class="t m0 x3 h5 y51 ff1 fs1 fc0 sc0 ls0 ws0">A.<span class="_"> </span>b<span class="_ _c"></span>o<span class="_ _1d"></span>o<span class="_ _c"></span>l<span class="_ _24"></span>ean<span class="_"> </span><span class="ff2">类型变量的值只能取真或假</span></div><div class="t m0 x3 h5 y52 ff1 fs1 fc0 sc0 ls0 ws0">B.<span class="_"> </span>fl<span class="_ _c"></span>o<span class="_ _1d"></span>at<span class="_"> </span><span class="ff2">是带符号的<span class="_ _35"> </span></span>3<span class="_ _c"></span>2<span class="_"> </span><span class="ff2">位浮点数</span></div><div class="t m0 x3 h5 y53 ff1 fs1 fc0 sc0 ls0 ws0">C.<span class="_"> </span>doubl<span class="_ _c"></span>e<span class="_ _35"> </span><span class="ff2">是带符号的<span class="_ _36"> </span></span>64<span class="_ _35"> </span><span class="ff2">位浮点数</span></div><div class="t m0 x3 h5 y54 ff1 fs1 fc0 sc0 ls0 ws0">D.<span class="_"> </span>ch<span class="_ _c"></span>a<span class="_ _1d"></span>r<span class="_"> </span><span class="ff2">是<span class="_ _35"> </span></span>8<span class="_ _4"> </span><span class="ff2">位<span class="_ _35"> </span></span>Un<span class="_ _c"></span>icode<span class="_"> </span><span class="ff2">字符</span></div></div></div><div class="pi" data-data='{"ctm":[1.611830,0.000000,0.000000,1.611830,0.000000,0.000000]}'></div></div><div id="pf3" class="pf w0 h0" data-page-no="3"><div class="pc pc3 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89498988/bg3.jpg"><div class="t m0 x1 h5 y55 ff1 fs1 fc0 sc0 ls0 ws0">18<span class="ff2">．下列关于基本数据类型的取值范围的描述中，正确的一个是（</span> <span class="_"> </span>B <span class="_ _1b"> </span><span class="ff2">）<span class="_ _2e"></span>。</span></div><div class="t m0 x2 h5 y56 ff1 fs1 fc0 sc0 ls0 ws0">A. byte<span class="_"> </span><span class="ff2">类型的取值范围是</span>-128<span class="ff2">～</span>128 <span class="_ _43"> </span>B. boolean<span class="_"> </span><span class="ff2">类型的取值范围是<span class="_ _36"> </span></span>true<span class="_"> </span><span class="ff2">或<span class="_ _36"> </span></span>false</div><div class="t m0 x2 h5 y57 ff1 fs1 fc0 sc0 ls0 ws0">C. char<span class="_"> </span><span class="ff2">类型的取值范围是<span class="_ _36"> </span></span>0<span class="ff2">～</span>65536<span class="_ _44"> </span> <span class="_ _3b"> </span>D. short<span class="_"> </span><span class="ff2">类型的取值范围是</span>-32767<span class="ff2">～</span>32767</div><div class="t m0 x1 h5 y58 ff1 fs1 fc0 sc0 ls0 ws0">19<span class="ff2">．下列关于<span class="_ _36"> </span></span>Java<span class="_"> </span><span class="ff2">语言简单数据类型的说法中，正确的一项是（</span> <span class="_"> </span>A <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h5 y59 ff1 fs1 fc0 sc0 ls0 ws0">A. <span class="_"> </span><span class="ff2">以<span class="_ _36"> </span></span>0<span class="_"> </span><span class="ff2">开头的整数代表<span class="_ _36"> </span></span>8<span class="_"> </span><span class="ff2">进制整型常量</span></div><div class="t m0 x2 h5 y5a ff1 fs1 fc0 sc0 ls0 ws0">B. <span class="_"> </span><span class="ff2">以<span class="_ _36"> </span></span>0x<span class="_"> </span><span class="ff2">或<span class="_ _36"> </span></span>0X<span class="_"> </span><span class="ff2">开头的整数代表<span class="_ _36"> </span></span>8<span class="_"> </span><span class="ff2">进制整型常量</span></div><div class="t m0 x2 h5 y5b ff1 fs1 fc0 sc0 ls0 ws0">C. boolean<span class="_"> </span><span class="ff2">类型的数据作为类成员变量的时候，相同默认的初始值为<span class="_ _36"> </span></span>true</div><div class="t m0 x2 h5 y5c ff1 fs1 fc0 sc0 ls0 ws0">D. double<span class="_"> </span><span class="ff2">类型的数据占计算机存储的<span class="_ _36"> </span></span>32<span class="_"> </span><span class="ff2">位</span></div><div class="t m0 x1 h5 y5d ff1 fs1 fc0 sc0 ls0 ws0">20<span class="ff2">．下列<span class="_ _36"> </span></span>Java<span class="_"> </span><span class="ff2">语句中，不正确的一项是（</span> <span class="_"> </span>C <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h5 y5e ff1 fs1 fc0 sc0 ls0 ws0">A. int $e, a, b = 10;<span class="_ _46"> </span> <span class="_ _1f"> </span>B. char c, d =<span class="ff3">‘</span>a<span class="ff3">’</span>;</div><div class="t m0 x2 h6 y5f ff1 fs1 fc0 sc0 ls0 ws0">C. float e = 0.0d;<span class="_ _47"> </span> <span class="_ _48"> </span>D. double c = 0.0f;</div><div class="t m0 x1 h5 y60 ff1 fs1 fc0 sc0 ls0 ws0">21<span class="ff2">．在编<span class="_ _c"></span>写<span class="_ _36"> </span></span>Java<span class="_"> </span><span class="ff2">程序时，如<span class="_ _c"></span>果不为类的成<span class="_ _c"></span>员变量定义初始<span class="_ _c"></span>值，</span>Java<span class="_"> </span><span class="ff2">会给出<span class="_ _c"></span>它们的默认值，</span></div><div class="t m0 x1 h5 y61 ff2 fs1 fc0 sc0 ls0 ws0">下列说法中不正确的一个是（<span class="ff1"> <span class="_"> </span>D <span class="_"> </span></span>）<span class="_ _45"></span>。</div><div class="t m0 x2 h5 y62 ff1 fs1 fc0 sc0 ls0 ws0">A. byte<span class="_"> </span><span class="ff2">的默认值是<span class="_ _36"> </span></span>0<span class="_ _49"> </span> <span class="_ _48"> </span>B. boolean<span class="_"> </span><span class="ff2">的默认值是<span class="_ _36"> </span></span>false</div><div class="t m0 x2 h5 y63 ff1 fs1 fc0 sc0 ls0 ws0">C. char<span class="_"> </span><span class="ff2">类型的默认值是‘</span>\0<span class="ff3">’<span class="_ _4a"> </span></span>D. long<span class="_"> </span><span class="ff2">类型的默认值是<span class="_ _36"> </span></span>0.0L</div><div class="t m0 x1 h5 y64 ff1 fs1 fc0 sc0 ls0 ws0">22<span class="ff2">．下列语句中不正确的一个是（</span> <span class="_"> </span>B <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h6 y65 ff1 fs1 fc0 sc0 ls0 ws0">A. float f = 1.1f;<span class="_ _4b"> </span> <span class="_ _48"> </span>B. byte b = 128;</div><div class="t m0 x2 h6 y66 ff1 fs1 fc0 sc0 ls0 ws0">C. double d = 1.1/0.0;<span class="_ _4c"> </span>D. char c = (char)1.1f;</div><div class="t m0 x1 h5 y67 ff1 fs1 fc0 sc0 ls0 ws0">23<span class="ff2">．下列表达式<span class="_ _36"> </span></span>1+2+ "aa"+3<span class="_"> </span><span class="ff2">的值是（</span> <span class="_"> </span>B <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h6 y68 ff1 fs1 fc0 sc0 ls0 ws0">A. "12aa3"<span class="_ _4d"> </span>B. "3aa3"<span class="_ _4e"> </span>C. "12aa"<span class="_ _4f"> </span>D. "aa3"</div><div class="t m0 x1 h5 y69 ff1 fs1 fc0 sc0 ls0 ws0">24<span class="ff2">．已知<span class="_ _36"> </span></span>y=2, z=3, n=4<span class="ff2">，则经过<span class="_ _36"> </span></span>n=n+ -y*z/n<span class="_"> </span><span class="ff2">运算后<span class="_ _36"> </span></span>n<span class="_"> </span><span class="ff2">的值为（</span> <span class="_"> </span>A <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h6 y6a ff1 fs1 fc0 sc0 ls0 ws0">A. 3<span class="_ _21"> </span>B. -1<span class="_ _3e"> </span>C. -12<span class="_ _38"> </span>D. -3</div><div class="t m0 x1 h5 y6b ff1 fs1 fc0 sc0 ls0 ws0">25<span class="ff2">．已知<span class="_ _36"> </span></span>a=2, b=3<span class="ff2">，则表达式<span class="_ _36"> </span></span>a%b*4%b<span class="_"> </span><span class="ff2">的值为（</span> <span class="_"> </span>A <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h6 y6c ff1 fs1 fc0 sc0 ls0 ws0">A. 2<span class="_ _21"> </span>B. 1<span class="_ _50"> </span>C. -1<span class="_ _51"> </span>D. -2</div><div class="t m0 x1 h5 y6d ff1 fs1 fc0 sc0 ls0 ws0">26<span class="ff2">．已知<span class="_ _36"> </span></span>x=2, y=3, z=4<span class="ff2">，则经过<span class="_ _36"> </span></span>z- = --y <span class="ff3">–</span> x--<span class="ff2">运算后，</span>z<span class="_"> </span><span class="ff2">的值为（</span> <span class="_"> </span>D <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h6 y6e ff1 fs1 fc0 sc0 ls0 ws0">A. 1<span class="_ _21"> </span>B. 2<span class="_ _50"> </span>C. 3<span class="_ _50"> </span>D. 4</div><div class="t m0 x1 h5 y6f ff1 fs1 fc0 sc0 ls0 ws0">27<span class="ff2">．表达式</span>(12==0) && (1/0 < 1)<span class="ff2">的值为（</span> <span class="_"> </span>B <span class="_"> </span><span class="ff2">）<span class="_ _45"></span>。</span></div><div class="t m0 x2 h5 y70 ff1 fs1 fc0 sc0 ls0 ws0">A. true<span class="_ _47"> </span>B. false<span class="_ _52"> </span>C. 0<span class="_ _50"> </span>D. <span class="_"> </span><span class="ff2">运行时抛出异常</span></div><div class="t m0 x1 h5 y71 ff1 fs1 fc0 sc0 ls0 ws0">28<span class="ff2">．<span class="_ _25"></span>现有<span class="_ _36"> </span><span class="ff1">1<span class="_"> </span></span>个<span class="_ _36"> </span><span class="ff1">char<span class="_"> </span></span>类型的变量<span class="_ _36"> </span><span class="ff1">c1=66<span class="_"> </span></span>和<span class="_ _36"> </span><span class="ff1">1<span class="_"> </span></span>个整型变量<span class="_ _36"> </span><span class="ff1">i=2</span>，<span class="_ _25"></span>当执行<span class="_ _36"> </span><span class="ff1">c1=c1+(char)i;</span>语句后，<span class="_ _53"></span><span class="ff1">c1</span></span></div><div class="t m0 x1 h5 y72 ff2 fs1 fc0 sc0 ls0 ws0">的值为（<span class="ff1"> <span class="_"> </span>D <span class="_"> </span></span>）<span class="_ _45"></span>。</div><div class="t m0 x2 h5 y73 ff1 fs1 fc0 sc0 ls0 ws0">A. 'd'<span class="_ _54"> </span>B. 'D'<span class="_ _55"> </span>C. 68<span class="_ _56"> </span>D. <span class="_"> </span><span class="ff2">语句在编译时出错</span></div><div class="t m0 x1 h5 y74 ff1 fs1 fc0 sc0 ls0 ws0">29<span class="ff2">．下列声明和赋值语句错误的是（</span> <span class="_ _1b"> </span>C<span class="_ _b"> </span><span class="ff2">）</span> </div><div class="t m0 x2 h6 y75 ff1 fs1 fc0 sc0 ls0 ws0">A. double w=3.1415;<span class="_ _38"> </span>B. String strl="bye"; </div><div class="t m0 x2 h6 y76 ff1 fs1 fc0 sc0 ls0 ws0">C. float z=6.74567;<span class="_ _57"> </span>D. boolean truth=true;</div><div class="t m0 x1 h5 y77 ff1 fs1 fc0 sc0 ls0 ws0">30. <span class="_"> </span><span class="ff2">整型数据类型中，需要内存空间最少的是（</span> <span class="_"> </span>D <span class="_ _1b"> </span><span class="ff2">）</span></div><div class="t m0 x2 h6 y78 ff1 fs1 fc0 sc0 ls0 ws0">A. short <span class="_ _58"> </span>B. long <span class="_ _1f"> </span>C. int <span class="_ _40"> </span>D. byte</div></div><div class="pi" data-data='{"ctm":[1.611830,0.000000,0.000000,1.611830,0.000000,0.000000]}'></div></div><div id="pf4" class="pf w0 h0" data-page-no="4"><div class="pc pc4 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89498988/bg4.jpg"><div class="c x1 y29 w2 h4"><div class="t m0 x0 h2 y79 ff1 fs0 fc0 sc0 ls0 ws0">1<span class="ff2">．<span class="_ _59"></span>假设<span class="_ _4"> </span><span class="ff1">a<span class="_"> </span></span>是<span class="_ _4"> </span><span class="ff1">i<span class="_ _c"></span>nt<span class="_ _36"> </span></span>类型的变量，<span class="_ _59"></span>并初始化为<span class="_ _4"> </span><span class="ff1">1</span>，<span class="_ _59"></span>则下列<span class="_ _5a"></span>（<span class="_ _1"> </span><span class="ff1">D<span class="_ _44"> </span></span>）<span class="_ _59"></span>是合法的条件语句？</span></div><div class="t m0 x3 h2 y7a ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">A</span>）<span class="ff1">if(a){}<span class="_ _5b"> </span></span>（<span class="ff1">B</span>）<span class="ff1">if(a<span class="_ _c"></span>+<span class="_ _1d"></span>+){}</span></div><div class="t m0 x3 h2 y7b ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">C</span>）<span class="ff1">if(a<span class="_ _c"></span>=<span class="_ _1d"></span>2){}<span class="_ _5c"> </span><span class="ff2">（</span>D<span class="ff2">）</span>if(true){}</span></div><div class="t m0 x0 h2 y7c ff1 fs0 fc0 sc0 ls0 ws0">2<span class="ff2">．下列说法中，不正确的一个是（<span class="_"> </span></span>C<span class="_ _3"> </span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x3 h2 y7d ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">A</span>）<span class="ff1">s<span class="_ _1d"></span>witc<span class="_ _c"></span>h<span class="_"> </span><span class="ff2">语句的功能可以由<span class="_ _4"> </span></span>if…e<span class="_ _c"></span>l<span class="_ _24"></span>se<span class="_"> </span>i<span class="_ _c"></span>f<span class="_"> </span><span class="ff2">语句来实现</span></span></div><div class="t m0 x3 h2 y7e ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">B</span>）若用于比较的数据类型为<span class="_ _4"> </span><span class="ff1">double<span class="_"> </span></span>型，则不可以用<span class="_ _36"> </span><span class="ff1">switc<span class="_ _c"></span>h<span class="_"> </span></span>语句来实现</div><div class="t m0 x3 h2 y7f ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">C</span>）<span class="ff1">if<span class="_"> </span>…e<span class="_ _c"></span>l<span class="_ _24"></span>se<span class="_"> </span>i<span class="_ _c"></span>f<span class="_"> </span><span class="ff2">语句的执行效率总是比<span class="_ _4"> </span></span>s<span class="_ _1d"></span>wit<span class="_ _c"></span>ch<span class="_ _36"> </span><span class="ff2">语句高</span></span></div><div class="t m0 x3 h2 y80 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">D</span>）<span class="ff1">case<span class="_"> </span></span>子句中可以有多个语句，并且不需要大括号<span class="ff1">{<span class="_ _c"></span>}<span class="_ _1d"></span><span class="ff2">括起来</span></span></div><div class="t m0 x0 h2 y81 ff1 fs0 fc0 sc0 ls0 ws0">3<span class="ff2">．设<span class="_ _b"> </span></span>a<span class="ff2">、</span>b<span class="_ _5d"> </span><span class="ff2">为<span class="_ _4"> </span></span>long<span class="_"> </span><span class="ff2">型变<span class="_ _c"></span>量，</span>x<span class="_ _c"></span><span class="ff2">、</span>y<span class="_"> </span><span class="ff2">为<span class="_ _4"> </span></span>fl<span class="_ _c"></span>oat<span class="_ _b"> </span><span class="ff2">型变<span class="_ _c"></span>量，</span>ch<span class="_"> </span><span class="ff2">为<span class="_ _4"> </span></span>cha<span class="_ _c"></span>r<span class="_"> </span><span class="ff2">类型<span class="_ _c"></span>变量且<span class="_ _c"></span>它们均</span></div><div class="t m0 x0 h2 y82 ff2 fs0 fc0 sc0 ls0 ws0">已被赋值，则下列语句中正确的是（<span class="_ _1"> </span><span class="ff1">B<span class="_ _1"> </span></span>）<span class="_ _f"></span>。</div><div class="t m0 x3 h2 y83 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">A</span>）<span class="ff1">s<span class="_ _1d"></span>witc<span class="_ _c"></span>h(x+y)<span class="_"> </span>{<span class="_ _c"></span>}<span class="_ _5e"> </span><span class="ff2">（</span>B<span class="ff2">）</span>sw<span class="_ _1d"></span>it<span class="_ _c"></span>ch(c<span class="_ _c"></span>h+<span class="_ _24"></span>1)<span class="_"> </span>{<span class="_ _c"></span>}</span></div><div class="t m0 x3 h2 y84 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">C</span>）<span class="ff1">sw<span class="_ _1d"></span>it<span class="_ _c"></span>ch<span class="_"> </span>ch<span class="_ _36"> </span>{<span class="_ _c"></span>}<span class="_ _5f"> </span><span class="ff2">（</span>D<span class="ff2">）</span>s<span class="_ _1d"></span>witc<span class="_ _c"></span>h(a+b);<span class="_"> </span>{}</span></div><div class="t m0 x0 h2 y85 ff1 fs0 fc0 sc0 ls0 ws0">4<span class="ff2">．下列循环体执行的次数是（<span class="_"> </span></span>C<span class="_ _3"> </span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x4 h3 y86 ff1 fs0 fc0 sc0 ls0 ws0">int<span class="_"> </span>y=2,<span class="_"> </span>x=<span class="_ _c"></span>4;</div><div class="t m0 x4 h3 y87 ff1 fs0 fc0 sc0 ls0 ws0">while<span class="_ _c"></span>(--x<span class="_ _35"> </span>!=<span class="_ _b"> </span>x/y){<span class="_"> </span>}</div><div class="t m0 x4 h2 y88 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">A</span>）<span class="ff1">1<span class="_ _60"> </span></span>（<span class="ff1">B</span>）<span class="ff1">2<span class="_ _42"> </span></span>（<span class="ff1">C</span>）<span class="ff1">3<span class="_ _61"> </span></span>（<span class="ff1">D</span>）<span class="ff1">4</span></div><div class="t m0 x0 h2 y89 ff1 fs0 fc0 sc0 ls0 ws0">5<span class="ff2">．下列循环体执行的次数是（<span class="_"> </span></span>B<span class="_ _3"> </span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x4 h3 y8a ff1 fs0 fc0 sc0 ls0 ws0">int<span class="_"> </span>x=10,<span class="_"> </span>y=<span class="_ _c"></span>30;</div><div class="t m0 x4 h3 y8b ff1 fs0 fc0 sc0 ls0 ws0">do{y<span class="_"> </span>-=<span class="_ _b"> </span>x;<span class="_ _62"> </span>x++<span class="_ _c"></span>;<span class="_ _63"> </span>}whil<span class="_ _c"></span>e<span class="_ _1d"></span>(x++<y--);</div><div class="t m0 x4 h2 y8c ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">A</span>）<span class="ff1">1<span class="_ _40"> </span></span>（<span class="ff1">B</span>）<span class="ff1">2<span class="_ _61"> </span></span>（<span class="ff1">C</span>）<span class="ff1">3<span class="_ _61"> </span></span>（<span class="ff1">D</span>）<span class="ff1">4</span></div><div class="t m0 x0 h2 y8d ff1 fs0 fc0 sc0 ls0 ws0">6<span class="ff2">．已知如下代码：</span></div><div class="t m0 x5 h3 y8e ff1 fs0 fc0 sc0 ls0 ws0">sw<span class="_ _1d"></span>it<span class="_ _c"></span>ch(m<span class="_ _1d"></span>){</div><div class="t m0 x6 h3 y8f ff1 fs0 fc0 sc0 ls0 ws0">ca<span class="_ _c"></span>s<span class="_ _1d"></span>e<span class="_"> </span>0:<span class="_"> </span>Sys<span class="_ _24"></span>t<span class="_ _c"></span>em.out.print<span class="_ _c"></span>ln("Condi<span class="_ _1d"></span>t<span class="_ _c"></span>ion<span class="_ _36"> </span>0");</div><div class="t m0 x6 h3 y90 ff1 fs0 fc0 sc0 ls0 ws0">ca<span class="_ _c"></span>s<span class="_ _1d"></span>e<span class="_"> </span>1:<span class="_"> </span>Sys<span class="_ _24"></span>t<span class="_ _c"></span>em.out.print<span class="_ _c"></span>ln("Condi<span class="_ _1d"></span>t<span class="_ _c"></span>ion<span class="_ _36"> </span>1");</div><div class="t m0 x6 h3 y91 ff1 fs0 fc0 sc0 ls0 ws0">ca<span class="_ _c"></span>s<span class="_ _1d"></span>e<span class="_"> </span>2:<span class="_"> </span>Sys<span class="_ _24"></span>t<span class="_ _c"></span>em.out.print<span class="_ _c"></span>ln("Condi<span class="_ _1d"></span>t<span class="_ _c"></span>ion<span class="_ _36"> </span>2");</div><div class="t m0 x6 h3 y92 ff1 fs0 fc0 sc0 ls0 ws0">ca<span class="_ _c"></span>s<span class="_ _1d"></span>e<span class="_"> </span>3:<span class="_"> </span>Sys<span class="_ _24"></span>t<span class="_ _c"></span>em.out.print<span class="_ _c"></span>ln("Condi<span class="_ _1d"></span>t<span class="_ _c"></span>ion<span class="_ _36"> </span>3");bre<span class="_ _c"></span>a<span class="_ _24"></span>k;</div><div class="t m0 x6 h3 y93 ff1 fs0 fc0 sc0 ls0 ws0">defa<span class="_ _c"></span>ul<span class="_ _24"></span>t<span class="_ _c"></span>:Sys<span class="_ _1d"></span>t<span class="_ _c"></span>em<span class="_ _1d"></span>.out.pri<span class="_ _c"></span>nt<span class="_ _24"></span>l<span class="_ _c"></span>n("Other<span class="_ _36"> </span>Condit<span class="_ _c"></span>ion"<span class="_ _1d"></span>);</div><div class="t m0 x7 h3 y94 ff1 fs0 fc0 sc0 ls0 ws0">}</div><div class="t m0 x8 h2 y95 ff2 fs0 fc0 sc0 ls0 ws0">当<span class="_ _4"> </span><span class="ff1">m<span class="_"> </span></span>的值为（<span class="_ _1"> </span><span class="ff1">D<span class="_ _64"> </span></span>）时，能输出<span class="ff3">“<span class="ff1">Condit<span class="_ _c"></span>ion<span class="_ _36"> </span>3</span>”</span></div><div class="t m0 x4 h2 y96 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">A</span>）<span class="ff1">2</span></div><div class="t m0 x4 h2 y97 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">B</span>）<span class="ff1">0</span>、<span class="ff1">1</span></div><div class="t m0 x4 h2 y98 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">C</span>）<span class="ff1">0</span>、<span class="ff1">1</span>、<span class="ff1">2</span></div><div class="t m0 x4 h2 y99 ff2 fs0 fc0 sc0 ls0 ws0">（<span class="ff1">D</span>）<span class="ff1">0</span>、<span class="ff1">1</span>、<span class="ff1">2</span>、<span class="ff1">3</span></div><div class="t m0 x0 h2 y9a ff1 fs0 fc0 sc0 ls0 ws0">7.<span class="_ _3"> </span><span class="ff2">给定某<span class="_ _4"> </span></span>ja<span class="_ _c"></span>va<span class="_ _36"> </span><span class="ff2">程序的<span class="_ _4"> </span></span>m<span class="_ _24"></span>a<span class="_ _c"></span>in<span class="_"> </span><span class="ff2">方法，如下：</span></div><div class="t m0 x4 h2 y9b ff1 fs0 fc0 sc0 ls0 ws0">publi<span class="_ _c"></span>c<span class="_ _36"> </span>s<span class="_ _1d"></span>t<span class="_ _c"></span>atic<span class="_"> </span>void<span class="_ _36"> </span>m<span class="_ _1d"></span>ai<span class="_ _c"></span>n<span class="_ _1"> </span><span class="ff2">（</span>String[]a<span class="_ _c"></span>r<span class="_ _24"></span>g<span class="ff2">）</span>{</div><div class="t m0 x9 h3 y9c ff1 fs0 fc0 sc0 ls0 ws0">Sys<span class="_ _1d"></span>te<span class="_ _c"></span>m<span class="_ _24"></span>.out<span class="_ _c"></span>.print<span class="_ _c"></span>(<span class="_"> </span>“<span class="_ _24"></span>Hel<span class="_ _c"></span>lo”<span class="_ _1d"></span>+<span class="_ _c"></span>ar<span class="_ _24"></span>gs[1])<span class="_"> </span>;</div><div class="t m0 x4 h3 y9d ff1 fs0 fc0 sc0 ls0 ws0">}</div><div class="t m0 x4 h2 y9e ff2 fs0 fc0 sc0 ls0 ws0">从命令行传参：<span class="ff1">peopl<span class="_ _c"></span>e<span class="_ _36"> </span>w<span class="_ _1d"></span>orl<span class="_ _c"></span>d<span class="_"> </span>nation<span class="ff2">，该程序的运行结果是（<span class="_ _1"> </span></span>B<span class="_ _62"> </span><span class="ff2">）<span class="_ _f"></span>。</span></span></div><div class="t m0 x4 h3 y9f ff1 fs0 fc0 sc0 ls0 ws0">A.<span class="_ _44"> </span>Hell<span class="_ _c"></span>o<span class="_ _35"> </span>pe<span class="_ _c"></span>ople</div><div class="t m0 x4 h3 ya0 ff1 fs0 fc0 sc0 ls0 ws0">B.<span class="_ _65"> </span>Hell<span class="_ _c"></span>o<span class="_ _35"> </span>world</div><div class="t m0 x4 h3 ya1 ff1 fs0 fc0 sc0 ls0 ws0">C.<span class="_ _65"> </span>Hell<span class="_ _c"></span>o<span class="_ _35"> </span>pe<span class="_ _c"></span>ople<span class="_ _36"> </span>world<span class="_"> </span>na<span class="_ _c"></span>ti<span class="_ _1d"></span>on</div><div class="t m0 x4 h2 ya2 ff1 fs0 fc0 sc0 ls0 ws0">D.<span class="_ _44"> </span><span class="ff2">运行时出现异常</span></div></div></div><div class="pi" data-data='{"ctm":[1.611830,0.000000,0.000000,1.611830,0.000000,0.000000]}'></div></div><div id="pf5" class="pf w0 h0" data-page-no="5"><div class="pc pc5 w0 h0"><img class="bi x0 y0 w1 h1" alt="" src="/image.php?url=https://csdnimg.cn/release/download_crawler_static/89498988/bg5.jpg"><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">8. <span class="_ _0"> </span><span class="ff2">给定如下<span class="_ _4"> </span></span>java<span class="_"> </span><span class="ff2">代码，编译运行时，结果是（</span> <span class="_"> </span>A <span class="_ _1"> </span><span class="ff2">）<span class="_ _f"></span>。<span class="ff1"> </span></span></div><div class="t m0 xa h3 ya3 ff1 fs0 fc0 sc0 ls0 ws0">public class Test{</div><div class="t m0 xa h3 ya4 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>public static void main (String args[]) {</div><div class="t m0 xa h3 ya5 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _66"> </span>for (int i=0;i<3; i++) {</div><div class="t m0 xa h3 ya6 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _67"> </span>System.out.print(i) ;</div><div class="t m0 xa h3 y6 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _68"> </span>}</div><div class="t m0 xa h3 ya7 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _68"> </span>System.out.print(i) ;</div><div class="t m0 xb h3 ya8 ff1 fs0 fc0 sc0 ls0 ws0">}</div><div class="t m0 x1 h3 ya9 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _69"> </span>}</div><div class="t m0 x1 h2 ya ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _64"> </span> <span class="_"> </span>A. <span class="_"> </span><span class="ff2">编译时报错<span class="_ _6a"> </span></span>B. <span class="_"> </span><span class="ff2">正确运行，输出<span class="_ _4"> </span></span>012</div><div class="t m0 x1 h2 yb ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _69"> </span>C. <span class="_"> </span><span class="ff2">正确运行，输出<span class="_ _4"> </span></span>123<span class="_ _18"> </span> <span class="_ _69"> </span>D. <span class="_"> </span><span class="ff2">正确运行，输出<span class="_ _4"> </span></span>0123</div><div class="t m0 x1 h2 yc ff1 fs0 fc0 sc0 ls0 ws0">9. <span class="_ _1"> </span><span class="ff2">给定<span class="_ _4"> </span></span>Java<span class="_"> </span><span class="ff2">代码如下所示，编译运行的结果是</span> <span class="_"> </span><span class="ff2">（</span> <span class="_ _1"> </span>A<span class="fc1"> <span class="_ _1"> </span></span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x1 h3 yd ff1 fs0 fc0 sc0 ls0 ws0">public static void main(String [] args)</div><div class="t m0 x1 h3 yaa ff1 fs0 fc0 sc0 ls0 ws0">{</div><div class="t m0 x1 h3 yab ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>int i ;</div><div class="t m0 x1 h3 yac ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>System.out.println("i="+i);</div><div class="t m0 x1 h3 yad ff1 fs0 fc0 sc0 ls0 ws0">}</div><div class="t m0 x2 h2 y12 ff1 fs0 fc0 sc0 ls0 ws0">A. <span class="_"> </span><span class="ff2">编译错误<span class="_ _6b"> </span></span>B. <span class="_"> </span><span class="ff2">运行时出现例外</span></div><div class="t m0 x2 h2 y13 ff1 fs0 fc0 sc0 ls0 ws0">C. <span class="_"> </span><span class="ff2">正常运行，输出<span class="_ _4"> </span></span>i=-1<span class="_ _6c"> </span>D. <span class="_"> </span><span class="ff2">正常运行，输出<span class="_ _4"> </span></span>i= 0</div><div class="t m0 x1 h2 y14 ff1 fs0 fc0 sc0 ls0 ws0">10. <span class="_"> </span><span class="ff2">给定如下<span class="_ _4"> </span></span>Java<span class="_"> </span><span class="ff2">程序，编译运行时，将在（</span><span class="fc1"> <span class="_"> </span></span>D <span class="_"> </span><span class="ff2">）语句出现错误。</span></div><div class="t m0 x1 h3 yae ff1 fs0 fc0 sc0 ls0 ws0">public class Test{</div><div class="t m0 x1 h3 yaf ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _1"> </span>public static void main(String args[]){</div><div class="t m0 x1 h2 y17 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _3"> </span>int i=0; <span class="_ _6d"> </span>//a<span class="_"> </span><span class="ff2">语句</span></div><div class="t m0 x1 h2 y18 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _3"> </span>for(;i<10;i++){ <span class="_ _4b"> </span>//b<span class="_"> </span><span class="ff2">语句</span></div><div class="t m0 x1 h3 yb0 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _64"> </span>if(i>5){</div><div class="t m0 x1 h2 y1a ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _69"> </span>String test="hello"; <span class="_ _15"> </span>//c<span class="_"> </span><span class="ff2">语句</span></div><div class="t m0 x1 h3 yb1 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _64"> </span>}</div><div class="t m0 x1 h3 yb2 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _3"> </span>}</div><div class="t m0 x1 h2 y1d ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _3"> </span>System.out.println(test); <span class="_ _3c"> </span>//d<span class="_"> </span><span class="ff2">语句</span></div><div class="t m0 x2 h3 yb3 ff1 fs0 fc0 sc0 ls0 ws0">A. a<span class="_ _6e"> </span>B. b<span class="_ _e"> </span>C. c<span class="_ _3f"> </span>D. d</div><div class="t m0 x1 h2 y1f ff1 fs0 fc0 sc0 ls0 ws0">11.<span class="ff2">分析下面的<span class="_ _4"> </span></span>java<span class="_"> </span><span class="ff2">代码片段，编译运行后的输出结果是（<span class="_ _37"> </span></span>D<span class="fc1"> <span class="_"> </span></span><span class="ff2">）<span class="_ _f"></span>。</span></div><div class="t m0 x1 h3 yb4 ff1 fs0 fc0 sc0 ls0 ws0">for(int i=0;i<6;i++){</div><div class="t m0 x1 h3 yb5 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _1"> </span>int k=++i;</div><div class="t m0 x1 h3 yb6 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _1"> </span>while(k<5){</div><div class="t m0 x1 h3 yb7 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>System.out.println(i);</div><div class="t m0 x1 h3 yb8 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _0"> </span>break;</div><div class="t m0 x1 h3 yb9 ff1 fs0 fc0 sc0 ls0 ws0"> <span class="_ _1"> </span>}</div><div class="t m0 x1 h3 yba ff1 fs0 fc0 sc0 ls0 ws0">}</div><div class="t m0 x2 h3 y27 ff1 fs0 fc0 sc0 ls0 ws0">A. 0 2 4<span class="_ _50"> </span>B. 2<span class="_ _17"></span> 4<span class="_ _15"> </span>C. 1<span class="_ _17"></span> 2 <span class="_ _1"> </span>3<span class="_ _6f"> </span>D. 1 3</div><div class="t m0 x1 h2 ybb ff1 fs0 fc0 sc0 ls0 ws0">12. <span class="_"> </span><span class="ff2">给定某<span class="_ _4"> </span></span>java<span class="_"> </span><span class="ff2">程序片断，如下：</span></div><div class="t m0 x1 h3 ybc ff1 fs0 fc0 sc0 ls0 ws0">int i=1;</div><div class="t m0 x1 h3 ybd ff1 fs0 fc0 sc0 ls0 ws0">int j=i++;</div><div class="t m0 x1 h3 ybe ff1 fs0 fc0 sc0 ls0 ws0">if((i>++j)&&(i++==j))</div><div class="t m0 x1 h3 ybf ff1 fs0 fc0 sc0 ls0 ws0">i+=j;</div></div><div class="pi" data-data='{"ctm":[1.611830,0.000000,0.000000,1.611830,0.000000,0.000000]}'></div></div>

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Java题库（共523题）(2).zip
Java题库（共523题）(2).zip
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Java题库（共523题）(2).zip 616.19KB
11 月前