java实验报告

1、实验1分析成绩单一、实验目的：掌握字符输入、输出流用法。二、实验代码：Fenxi:import java.util.*;public class Fenxipublic static double getTotalScore(String s)Scanner scanner=new Scanner(s);scanner.useDelimiter("F0123456789.+");double totalScore=0;while(scanner.hasNext()trydouble score=scanner.nextDouble();totalScore=totalSco

2、re+score;catch(InputMismatchException exp)String t=scanner.next(); return totalScore;AnalysisResult :import java.io.*;import java.util.*;public class AnalysisResultpublic static void main(String args口儿File fRead=new File("score.txt");File fWrite=new File("scoreAnalysis.txt");tryW

3、riter out= new FileWriter(fWrite,true);/以尾加方式创建指向文件fWrite 的 out流BufferedWriter bufferWrite=new BufferedWriter(out); / 创建指向 out 的 bufferWrite 流Reader in=new FileReader(fRead); / 创建指向文件 fRead 的 in 流BufferedReader bufferRead=new BufferedReader(in);/ 创建指向 in 的 bufferReadString str=null;while (str=buffer

4、Read.readLine()!=null)double totalScore =Fenxi.getTotalScore(str);str=str+"总分："+totalScore;System.out.println(str);bufferWrite.write(str);bufferWrite.newLine();bufferRead.close();bufferWrite.close();catch(IOException e)System.out.println(e.toString();三、结果截图:c： C:PrograM FilesXinox Soft>

5、areJCreatorV3GE2001. eze总总总物理67分, 物理98分, 物理分,inue .n r-T+-T+T o 2 2 8 c 7 9 6Z于to数数数y e 三四s,y 睾周an姓姓姓四、实验分析：(1) 改进程序，使得能统计出每个学生的平均成绩。答：(2) 现在有如下格式的货物明细(文本格式)goods.txt品名：电视，length:102 cm,width:89 cm,height:56 cm.品名：轿车，length:4502 cm,width:178 cm,height:156 cm.品名：桌子，length:125 cm,width:78 cm,height:68

6、 cm.答：CalculateVolume.javaimport java.io.*;import java.util.*;public class CalculateVolumepublic static void main(String args口儿File fRead=new File("goods.txt");File fWrite=new File("goodsVolume.txt");tryWriter out=new FileWriter(fWrite,true);BufferedWriter bufferWrite=new Buffere

7、dWriter(out);Reader in=new FileReader(fRead);BufferedReader bufferRead=new BufferedReader(in);String str=null;while(str=bufferRead.readLine()!=null)double s=Jisuan.getVolume(str);str=str+"体积:"+s+"cmA3"System.out.println(str);bufferWrite.write(str);bufferWrite.newLine();bufferRead

8、.close();bufferWrite.close();catch(IOException e)System.out.println(e.toString();Jisuan.javaimport java.util.*;public class Jisuanpublic static double getVolume(String s)Scanner scanner=new Scanner(s);scanner.useDelimiter("A0123456789.+");double volume=1;while(scanner.hasNext()trydouble di

9、stance=scanner.nextDouble();volume=volume*distance;catch(InputMismatchException exp)String t=scanner.next();return volume;品口的品PF实验2统计英文单词一、实验目的：掌握使用Scanner类解析文件。二、实验代码：Dictionary.java:import java.util.*;public class Dictionarypublic static void main(String args口儿Vector<String> allWord,noSameWo

10、rd;WordStatistic statistic=new WordStatistic();statistic.setFileName("hello.txt");statistic.wordStatistic();/statistic 调用 WordStatistic()方法allWord=statistic.getAllWord();noSameWord=statistic.getNoSameWord();System.out.println("共有"+allWord.size()+"个英文单词"力System.out.print

11、ln("有"+noSameWord.size()+"个互不相同英文单词 ");System.out.println("按字典顺序排列：")；String s=new String noSameWord.size();for(int i=0;i<noSameWord.size();i+) si=noSameWord.elementAt(i);Arrays.sort(s);for(int i=0;i<noSameWord.size();i+) System.out.println(si+"");Output

12、WordMess.java:import java.util.*;public class OutputWordMesspublic static void main(String args口儿Vector<String> allWord,noSameWord;WordStatistic statistic=new WordStatistic();statistic.setFileName("hello.txt");statistic.wordStatistic();/statistic 调用 WordStatistic()方法allWord=statistic

13、.getAllWord();noSameWord=statistic.getNoSameWord();System.out.println("共有"+allWord.size()+"个英文单词"力System.out.println("有"+noSameWord.size()+"个互不相同英文单词 ")；System.out.println("按出现频率排列：")；int count=new intnoSameWord.size();for(int i=0;i<noSameWord.siz

14、e();i+)String s1=noSameWord.elementAt(i);for(int j=0;j<allWord.size();j+)String s2=allWord.elementAt(j);if(s1.equals(s2) counti+;for(int m=0;m<noSameWord.size();m+)for(int n=m+1;n<noSameWord.size();n+)if(countn>countm)String temp=noSameWord.elementAt(m);noSameWord.setElementAt(noSameWord

15、.elementAt(n),m);noSameWord.setElementAt(temp,n);int t=countm;countm=countn; countn=t;for(int m=0;m<noSameWord.size();m+)double frequency=(1.0*countm)/allWord.size();System.out.printf("%s:%-7.3f",noSameWord.elementAt(m),frequency); WordStatistic.java:import java.io.*;import java.util.*;

16、public class WordStatisticVector<String> allWord,noSameWord;File file=new File("english.txt");Scanner sc=null;String regex;WordStatistic()allWord=new V ector<String>();noSameWord=new Vector<String>();/regex 是由空格数字和符号 (!"#$&'()*+,-./:;<=>?人_'|)组成的正则表

17、达式regex="sdpPunct+"trysc=new Scanner(file);创建指向 file 的 scsc.useDelimiter(regex); /sc 调用 useDelimiter(String regex)方法，向参数传递 regexcatch(IOException exp)System.out.println(exp.toString();void setFileName(String name) file=new File(name);trysc=new Scanner(file);sc.useDelimiter(regex);catch(IOE

18、xception exp)System.out.println(exp.toString();public void wordStatistic()trywhile(sc.hasNext()String word=sc.next();allWord.add(word);if(!noSameWord.contains(word)noSameWord.add(word);catch(Exception e) public Vector<String> getAllWord()return allWord;public Vector<String> getNoSameWord

19、()return noSameWord;三、结果截图:四、实验分析：按字典顺序输出全部不相同的单词。答：Dictionary.javaimport java.util.*;public class Dictionarypublic static void main(String args口儿Vector<String> allWord,noSameWord;WordStatistic statistic=new WordStatistic();statistic.setFileName("hello.txt");statistic.wordStatistic()

20、;/statistic调用 WordStatistic() 方法allWord=statistic.getAllWord();noSameWord=statistic.getNoSameWord();System.out.println(" 共有"+allWord.size()+"个英文单词");System.out.println("有"+noSameWord.size()+"个互不相同英文单词");System.out.println("按字典顺序排列:");String s=new Str

21、ing noSameWord.size();for(int i=0;i<noSameWord.size();i+)si=noSameWord.elementAt(i);Arrays.sort(s);for(int i=0;i<noSameWord.size();i+)System.out.println(si+"");> D:jdkl 6JC reatorV 3GE 2 001. exe升有其文单词食4个互卡油同案文单词茸字典顺序由呼arehello"studentsWBPress any key to continue.实验3读取压缩文件一、实

22、验目的：掌握 ZipInputStream流的使用。二、实验代码：import java.io.*;import java.util.zip.*;public class ReadZipFile public static void main(String args) File f=new File("book.zip");File dir=new File("mybook");byte b=new byte100;dir.mkdir();tryZipInputStream in=new ZipInputStream(new FileInputStrea

23、m(f);ZipEntry zipEntry=null;while(zipEntry=in.getNextEntry()!=null) File file=new File(dir,zipEntry.getName();FileOutputStream out=new FileOutputStream(file);int n=-1;System.out.println(file.getAbsolutePath()+"的内容：");while(n=in.read(b,0,100)!=-1) String str=new String(b,0,n);System.out.pri

24、ntln(str);out.write(b,0,n); out.close();in.close();catch(IOException ee) System.out.println(ee);三、结果截图：四、实验分析：编写一个GUI程序，提供一个对话框，用户可以使用这个对话框选择要解压缩的Zip文件,设置解压后所得到的文件的存放目录。答：import java.io.*;import java.util.zip.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class MyFrame exten

25、ds JFrame implements ActionListenerprivate static final long serialVersionUID = 1L;private JFileChooser fileChooser = new JFileChooser(".");private JButton button = new JButton("打开想要解压文件 ");public MyFrame() this.setTitle("解压");this.setPreferredSize(new Dimension(500, 40

26、0);this.getContentPane().add(button, BorderLayout.CENTER);button.addActionListener(this);this.pack();this.setLocationRelativeTo(null);this.setlgnoreRepaint(true);public void actionPerformed(ActionEvent e) Object source = e.getSource();if (source instanceof JButton) openFile();public void openFile()

27、fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONL Y); fileChooser.setDialogTitle("打开 Zip 文件夹");int ret = fileChooser.showOpenDialog(null);if (ret = JFileChooser.APPROVE_OPTION) System.out.println(fileChooser.getSelectedFile().getAbsolutePath();File f=new File("book.zip&quo

28、t;);File dir=new File("mybook");byte b=new byte100;dir.mkdir();tryZipInputStream in=new ZipInputStream(new FileInputStream(f);ZipEntry zipEntry=null;while(zipEntry=in.getNextEntry()!=null)File file=new File(dir,zipEntry.getName();FileOutputStream out=new FileOutputStream(file);int n=-1;Sys

29、tem.out.println(file.getAbsolutePath()+"的内容:");while(n=in.read(b,0,100)!=-1)String str=new String(b,0,n);System.out.println(str);out.write(b,0,n);out.close();in.close();catch(IOException ee)System.out.println(ee);public static void main(String口 args) Frame frame = new MyFrame();frame.setVi

30、sible(true);补充 1、用命令行带参的方式实现 dir命令的功能，不带参数表示查询当前目录，带参数表示查询指定的目录，如 dir c:,并支持dir *.java的文件后缀过滤功能。答：Dir.javaimport java.io.*;import java.util.*;import java.text.*;public class Dir public void GoBack()this.dir(System.getProperty("user.dir"),1);public void GoBack(String userdir) if(userdir.equ

31、als("*.java")this.dir(System.getProperty("user.dir"),0); else this.dir(userdir,1);public void dir(String str,int m) String dir=null;int n;double Byte=0;dir=str;n=m;File f=new File(dir); if (!f.exists() System.out.println("文件或目录不存在！");System.exit(0);while (f.isDirectory(

32、) File口 dire=f.listFiles();for (int i=0; i<dire.length; i+) Byte+=direi.length();SimpleDateFormat formatter=new SimpleDateFormat ("yyyy/MM/dd h:m");String date=formatter.format(new Date(direi.lastModified() if(m=0)if(direi.getName().endsWith(".java") System.out.printf("%-

33、20s%-10s%-20d%-20s n",date,"",direi.length(),direi.getName(); else if(direi.isFile()System.out.printf("%-20s%-10s%-20d%-20s n",date,"",direi.length(),direi.getName(); else System.out.printf("%-20s%-10s%-20s%-20s n",date,"<DIR>",""

34、;,direi.getName(); break;public static void main(String口 args) throws IOExceptionDir test=new Dir();String userdir=System.getProperty("user.dir");System.out.print(userdir+"> ");System.out.print("dir ");/if(new InputStreamReader(System.in).read()=13)显示当前目录/ test.GoBac

35、k();Scanner scanner=new Scanner(System.in);userdir=scanner.next();test.GoBack(userdir);2、给当前的类所在的java源文件添加行号，拷贝到另一个文件temp.txt答：Temp.javaimport java.io.*;public class Temp public static void main(String口 args) File file = new File("Temp.java");tryFile tempFile = new File("temp.txt"

36、;);FileReader inOne = new FileReader(file);BufferedReader inTwo = new BufferedReader(inOne );FileWriter tofile = new FileWriter(tempFile);BufferedWriter out = new BufferedWriter(tofile);int i = 0;String s = inTwo.readLine();while (s != null) i+;out.write(i + " " + s);out.newLine();s = inTw

37、o.readLine();inOne.close();inTwo.close();out.flush();out.close(); tofile.close();catch (FileNotFoundException e) e.printStackTrace();catch (IOException e) e.printStackTrace();System.out.println("已给当前的类所在的java源文件添加行号，拷贝 到temp.txt");1 . CiAPtogram FilesVCreator ProGE2001.#X8已给当前的类所在的jaua源文件及

38、加行号,Ppesa an 1/ key to continue . .M3、编写一个图书类（Book）,要求:每本图书数据包括图书ISBN号、图书名、单价，即在类 Book中要声明存放这3个数据 的成员变量。定义1个构造方法，此构造方法能将当前图书的ISBN号、图书名、单价赋成用户提供的真实数据值，而不是系统默认值。能用图书ISBN号作为关键属性来判断两本图书是否相等，即在类 Book中要重新编写从 父类 Object 继承得到的 public boolean equals( Object obj)方法。能用图书ISBN号作为关键属性来判断两本图书的大小(即先后顺序)，即让类Book实现jav

39、a.lang.Comparable 接口， 并实现接口 Comparable 中的 public int compareTo( T o) 方法。 能用打印图书对象的方式将当前图书的ISBN号、图书名、单价在一行打印，并且每个数据间用Tab间作为分隔。即在类Book中要重新编写从父类 Object继承得到的public String toString()方法。编写上面图书类的测试类(Test.java ),要求： 编写代码创建封装以下两个图书数据的图书对象，并将这两个对象打印ISBN图书名单价978-7-115-16922-8Java程序设计与问题解决49.00978-7-900680-38-9东软Java软件工程师实例参考手 册58.00编写