Java程序设计实验报告

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实验题目不使用IDE，编写HelloWorld程序，并使用Windows的命令行控制台编译java源代码，使用java命令执行字节码文件。编写Java程序实现回形方阵。通过程序输入方阵的阶数，程序输入该方阵。编写Java程序实现大数阶乘的计算。通过程序输入一个整数，程序输入该整数的阶乘。编写Java程序实现精确的小数类，完成小数的乘法运算。编写简单的学生管理程序，包括学生类和班级类，创建班级对象，并创建该班级的学生对象。实验题目（1）Shape为抽象类，其中包含draw方法；（2）Circle和Rectangle为Shape类的子类，均重写了父类的draw方法；（3）在Board中用一个Shape数组保存6个Shape类的派生类的对象，并在一个名为refresh的方法调用数组中每个对象的draw方法；（4）Board类的main方法中创建Board类的对象，调用refresh方法。实验题目（1）Shape为接口，其中包含draw方法；（2）Circle、Rectangle和Triangle均实现了Shape接口，重写了接口中的draw方法；

<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/90213241/2/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/90213241/bg1.jpg"/><div class="t m0 x1 h2 y1 ff1 fs0 fc0 sc0 ls0 ws0">中北大学大数据学院</div><div class="t m0 x2 h3 y2 ff1 fs1 fc0 sc0 ls0 ws0">实验报告</div><div class="c x3 y3 w2 h4"><div class="t m0 x4 h5 y4 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y5 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y6 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y7 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y8 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y9 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">第</span></div><div class="t m0 x4 h5 ya ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">一</span></div><div class="t m0 x4 h5 yb ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">针</span></div><div class="t m0 x4 h5 yc ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 yd ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 ye ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 yf ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y10 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">装</span></div><div class="t m0 x4 h5 y11 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">订</span></div><div class="t m0 x4 h5 y12 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">线</span></div><div class="t m0 x4 h5 y13 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y14 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y15 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y16 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y17 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y18 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">第</span></div><div class="t m0 x4 h5 y19 ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">二</span></div><div class="t m0 x4 h5 y1a ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">针</span></div><div class="t m0 x4 h5 y1b ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y1c ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y1d ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div><div class="t m0 x4 h5 y1e ff2 fs2 fc1 sc0 ls0 ws0"><span class="fc4 sc0">…</span></div></div><div class="t m0 x5 h6 y1f ff1 fs3 fc0 sc1 ls0 ws0">课程名称<span class="_"> </span><span class="sc0">Java<span class="_ _0"> </span>程序设计<span class="_ _1"> </span></span>学号<span class="_ _1"> </span><span class="sc0">1907040501<span class="_ _0"> </span></span>学生姓名<span class="_ _1"> </span><span class="sc0">张秀锦<span class="_"> </span></span>教师<span class="_ _2"> </span>李雯</div><div class="c x6 y20 w3 h7"><div class="t m0 x7 h6 y21 ff1 fs3 fc0 sc1 ls0 ws0">专业</div></div><div class="c x8 y20 w4 h7"><div class="t m0 x7 h8 y22 ff1 fs4 fc0 sc1 ls0 ws0">计算机<span class="_ _3"></span>类</div></div><div class="c x9 y20 w5 h7"><div class="t m0 x7 h6 y21 ff1 fs3 fc0 sc1 ls0 ws0">实验室名称</div></div><div class="c xa y20 w6 h7"><div class="t m0 x4 h8 y22 ff3 fs4 fc0 sc1 ls0 ws0"><span class="ff1">11<span class="_ _3"></span>-504<span class="_"> </span>□1<span class="_ _3"></span>1-50<span class="_ _3"></span>1</span></div></div><div class="c xb y20 w7 h7"><div class="t m0 xc h6 y21 ff1 fs3 fc0 sc1 ls0 ws0">实验时间</div></div><div class="c xd y20 w8 h7"><div class="t m0 xe h8 y22 ff1 fs4 fc0 sc1 ls0 ws0">2021<span class="_ _4"> </span>年<span class="_ _4"> </span>5<span class="_"> </span>月<span class="_ _4"> </span>17<span class="_"> </span>日</div></div><div class="c x6 y23 w9 h9"><div class="t m0 xf h6 y24 ff1 fs3 fc0 sc1 ls0 ws0">实验名称</div><div class="t m0 x10 h6 y25 ff1 fs3 fc0 sc1 ls0 ws0">利用<span class="_ _0"> </span>IO<span class="_ _4"> </span>流实<span class="_ _3"></span>现文件内容的写<span class="_ _3"></span>入与读取</div></div><div class="c x6 y26 w9 ha"><div class="t m0 xf h6 y27 ff1 fs3 fc0 sc1 ls0 ws0">实验目的</div><div class="t m0 xf h6 y28 ff1 fs3 fc0 sc0 ls0 ws0">(1)、熟悉字符流的两个顶层父类<span class="_ _4"> </span>1，Reader<span class="_"> </span>（输入）2，Writer（输出）</div><div class="t m0 xf h6 y29 ff1 fs3 fc0 sc0 ls0 ws0">(2)、熟练使用字符流的子类<span class="_ _4"> </span>FileWriter<span class="_ _0"> </span>与<span class="_ _4"> </span>FileReader<span class="_ _0"> </span>读写文件内容</div><div class="t m0 xf h6 y2a ff1 fs3 fc0 sc0 ls0 ws0">(3)、熟<span class="_ _3"></span>练<span class="_ _3"></span>使用<span class="_ _3"></span>字符流<span class="_ _3"></span>缓冲<span class="_ _3"></span>区<span class="_ _5"> </span>BufferdWriter<span class="_"> </span>与<span class="_ _0"> </span>BufferedReader<span class="_"> </span>类<span class="_ _3"></span>高<span class="_ _3"></span>效读写<span class="_ _3"></span>文件<span class="_ _3"></span>内</div><div class="t m0 xf h6 y2b ff1 fs3 fc0 sc0 ls0 ws0">容</div><div class="t m0 xf h6 y2c ff1 fs3 fc0 sc0 ls0 ws0">(4)<span class="_ _6"></span>、<span class="_ _6"></span>熟<span class="_ _6"></span>悉<span class="_ _7"> </span>BufferdWriter<span class="_ _8"> </span>类<span class="_ _6"></span>特<span class="_ _6"></span>有<span class="_ _6"></span>方<span class="_ _9"></span>法<span class="_ _a"> </span>newLine()<span class="_ _6"></span>与<span class="_ _a"> </span>BufferedReader<span class="_ _8"> </span>类<span class="_ _6"></span>特<span class="_ _6"></span>有<span class="_ _9"></span>方<span class="_ _6"></span>法</div><div class="t m0 xf h6 y2d ff1 fs3 fc0 sc0 ls0 ws0">readLine()。</div><div class="t m0 xf h6 y2e ff1 fs3 fc0 sc0 ls0 ws0">(5)、熟悉关闭流的方法。</div></div><div class="c x6 y2f w9 hb"><div class="t m0 xf h6 y30 ff1 fs3 fc0 sc1 ls0 ws0">实验内容</div><div class="t m0 xf hc y31 ff4 fs3 fc0 sc0 ls0 ws0">需求：在一个<span class="_ _4"> </span><span class="ff5">BufferedW<span class="_ _b"></span>riterReaderDemo.<span class="_ _4"> </span>Java<span class="_ _4"> </span><span class="ff4">程序完成</span></span></div><div class="t m0 xf hc y32 ff5 fs3 fc0 sc0 ls0 ws0">1<span class="ff4">、利用<span class="_ _c"> </span></span>FileW<span class="_ _b"></span>riter<span class="_ _4"> </span><span class="ff4">类<span class="_ _3"></span>对象新<span class="_ _3"></span>建一<span class="_ _3"></span>个文<span class="_ _3"></span>本文档<span class="_ _c"> </span></span>a.txt,<span class="ff4">高效<span class="_ _3"></span>的写<span class="_ _3"></span>入一<span class="_ _3"></span>段文本<span class="_ _3"></span>，用<span class="_ _0"> </span></span>newLine()</div><div class="t m0 xf hc y33 ff4 fs3 fc0 sc0 ls0 ws0">方法进行换行，文档内容如下</div><div class="t m0 xf hc y34 ff5 fs3 fc0 sc0 ls0 ws0">1<span class="ff4">、利用<span class="_ _d"> </span></span>FileReader<span class="_ _d"> </span><span class="ff4">类对象将<span class="_ _d"> </span></span>a.txt<span class="_ _e"> </span><span class="ff4">文件中的内容，<span class="_ _f"></span>利用<span class="_ _d"> </span><span class="ff5">readLine()</span>方法<span class="_ _3"></span>高效的复制在<span class="_ _d"> </span><span class="ff5">b.txt</span></span></div><div class="t m0 xf hc y35 ff4 fs3 fc0 sc0 ls0 ws0">文件中。</div><div class="t m0 xf hc y36 ff4 fs3 fc0 sc0 ls0 ws0">对给出需求进行数据建模。</div></div><div class="c x6 y37 w9 hd"><div class="t m0 xf h6 y38 ff1 fs3 fc0 sc1 ls0 ws0">实验过程或源代<span class="_ _3"></span>码</div><div class="t m0 xf he y39 ff6 fs5 fc2 sc0 ls0 ws0">import<span class="_"> </span><span class="ff7 fc0">ja<span class="_ _3"></span>va.io.Bu<span class="_ _3"></span>fferedRead<span class="_ _3"></span>er;</span></div><div class="t m0 xf he y3a ff6 fs5 fc2 sc0 ls0 ws0">import<span class="_"> </span><span class="ff7 fc0">ja<span class="_ _3"></span>va.io.Bu<span class="_ _3"></span>fferedWrit<span class="_ _3"></span>er;</span></div><div class="t m0 xf he y3b ff6 fs5 fc2 sc0 ls0 ws0">import<span class="_"> </span><span class="ff7 fc0">ja<span class="_ _3"></span>va.io.Fi<span class="_ _3"></span>leReader;</span></div><div class="t m0 xf he y3c ff6 fs5 fc2 sc0 ls0 ws0">import<span class="_"> </span><span class="ff7 fc0">ja<span class="_ _3"></span>va.io.Fi<span class="_ _3"></span>leWriter;</span></div><div class="t m0 xf he y3d ff6 fs5 fc2 sc0 ls0 ws0">import<span class="_"> </span><span class="ff7 fc0">ja<span class="_ _3"></span>va.io.IO<span class="_ _3"></span>Exception;</span></div><div class="t m0 xf he y3e ff6 fs5 fc2 sc0 ls0 ws0">public<span class="_"> </span>cl<span class="_ _3"></span>ass<span class="_"> </span><span class="ff7 fc0">Buff<span class="_ _3"></span>eredWriter<span class="_ _3"></span>Reader<span class="_"> </span>{</span></div><div class="t m0 x3 he y3f ff6 fs5 fc2 sc0 ls0 ws0">public<span class="_"> </span>st<span class="_ _3"></span>atic<span class="_"> </span>voi<span class="_ _3"></span>d<span class="_"> </span><span class="ff7 fc0">main(Str<span class="_ _3"></span>ing[]<span class="_"> </span><span class="fc3">args<span class="_ _3"></span></span>)<span class="_"> </span></span>throw<span class="_ _3"></span>s<span class="_"> </span><span class="ff7 fc0">IOExcept<span class="_ _3"></span>ion<span class="_"> </span>{</span></div><div class="t m0 x10 he y40 ff8 fs5 fc0 sc0 ls0 ws0">writer<span class="ff7">();</span></div><div class="t m0 x10 he y41 ff8 fs5 fc0 sc0 ls0 ws0">reader<span class="ff7">();</span></div><div class="t m0 x3 he y42 ff7 fs5 fc0 sc0 ls0 ws0">}</div><div class="t m0 x3 he y43 ff6 fs5 fc2 sc0 ls0 ws0">public<span class="_"> </span>st<span class="_ _3"></span>atic<span class="_"> </span>voi<span class="_ _3"></span>d<span class="_"> </span><span class="ff7 fc0">writer()<span class="_"> </span></span>t<span class="_ _3"></span>hrows<span class="_"> </span><span class="ff7 fc0">IO<span class="_ _3"></span>Excepti<span class="_ _3"></span>on<span class="_"> </span>{</span></div></div></div><div class="pi" data-data='{"ctm":[1.611830,0.000000,0.000000,1.611830,0.000000,0.000000]}'></div></div>