Java实验项目四 Java高级编程 第1部分.doc

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1、Java实验项目四 Java高级编程第1部分 输入输出流1 学读汉字 ChineseCharacters.javaimport java.io.*;import java.util.StringTokenizer;public class ChineseCharacters public StringBuffer getChinesecharacters(File file) StringBuffer hanzi=new StringBuffer(); try FileReader inOne=【代码1】 /创建指向文件f的inOne 的对象 BufferedReader inTwo=【代码2

2、】 /创建指向文件inOne的inTwo 的对象 String s=null; int i=0; while(s=【代码3】)!=null) /inTwo读取一行 StringTokenizer tokenizer=new StringTokenizer(s, ,n ); while(tokenizer.hasMoreTokens() hanzi.append(tokenizer.nextToken(); catch(Exception e) return hanzi; StudyFrame.javaimport java.awt.*;import java.awt.event.*;impor

3、t java.io.*;import javax.sound.sampled.*;public class StudyFrame extends Frame implements ItemListener,ActionListener,Runnable ChineseCharacters chinese; Choice choice; Button getCharacters,voiceCharacters; Label showCharacters; StringBuffer trainedChinese=null; Clip clip=null; Thread voiceThread; i

4、nt k=0; Panel pCenter; CardLayout mycard; TextArea textHelp; MenuBar menubar; Menu menu; MenuItem help; public StudyFrame() chinese=new ChineseCharacters(); choice=new Choice(); choice.add(training1.txt); choice.add(training2.txt); choice.add(training3.txt); showCharacters=new Label(,Label.CENTER);

5、showCharacters.setFont(new Font(宋体,Font.BOLD,72); showCharacters.setBackground(Color.green); getCharacters=new Button(下一个汉字); voiceCharacters=new Button(发音); voiceThread=new Thread(this); choice.addItemListener(this); voiceCharacters.addActionListener(this); getCharacters.addActionListener(this); Pa

6、nel pNorth=new Panel(); pNorth.add(new Label(选择一个汉字字符组成的文件); pNorth.add(choice); add(pNorth,BorderLayout.NORTH); Panel pSouth=new Panel(); pSouth.add(getCharacters); pSouth.add(voiceCharacters); add(pSouth,BorderLayout.SOUTH); pCenter=new Panel(); mycard=new CardLayout(); pCenter.setLayout(mycard);

7、textHelp=new TextArea(); pCenter.add(hanzi,showCharacters); pCenter.add(help,textHelp); add(pCenter,BorderLayout.CENTER); menubar=new MenuBar(); menu=new Menu(帮助); help=new MenuItem(关于学汉字); help.addActionListener(this); menu.add(help); menubar.add(menu); setMenuBar(menubar); setSize(350,220); setVis

8、ible(true); addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) System.exit(0); ); validate(); public void itemStateChanged(ItemEvent e) String fileName=choice.getSelectedItem(); File file=new File(fileName); trainedChinese=chinese.getChinesecharacters(file); k=0; mycard.s

9、how(pCenter,hanzi) ; public void actionPerformed(ActionEvent e) if(e.getSource()=getCharacters) if(trainedChinese!=null) char c=trainedChinese.charAt(k); k+; if(k=trainedChinese.length() k=0; showCharacters.setText(+c); else showCharacters.setText(请选择一个汉字字符文件); if(e.getSource()=voiceCharacters) if(!

10、(voiceThread.isAlive() voiceThread=new Thread(this); try voiceThread.start(); catch(Exception exp) if(e.getSource()=help) mycard.show(pCenter,help) ; try File helpFile=new File(help.txt); FileReader inOne=【代码4】 /创建指向文件helpFile的inOne 的对象 BufferedReader inTwo=【代码5】 /创建指向文件inOne的inTwo 的对象 String s=null

11、; while(s=inTwo.readLine()!=null) textHelp.append(s+n); inOne.close(); inTwo.close(); catch(IOException exp) public void run() voiceCharacters.setEnabled(false); try if(clip!=null) clip.close() clip=AudioSystem.getClip(); File voiceFile=new File(showCharacters.getText().trim()+.wav); clip.open(Audio

12、System.getAudioInputStream(voiceFile); catch(Exception exp) clip.start(); voiceCharacters.setEnabled(true); StudyMainClass.javapublic class StudyMainClass public static void main(String args) new StudyFrame(); 2 统计英文单词字 模板代码 WordStatistic.javaimport java.io.*;import java.util.Vector;public class Wor

13、dStatistic Vector allWorsd,noSameWord; WordStatistic() allWorsd=new Vector(); noSameWord=new Vector(); public void wordStatistic(File file) try RandomAccessFile inOne=【代码1】 /创建指向文件file的inOne 的对象 RandomAccessFile inTwo=【代码2】 /创建指向文件file的inTwo 的对象 long wordStarPostion=0,wordEndPostion=0; long length=i

14、nOne.length(); int flag=1; int c=-1; for(int k=0;k=length;k+) c=【代码3】 / inOne调用read()方法 boolean boo=(c=A)|(c=a); if(boo) if(flag=1) wordStarPostion=inOne.getFilePointer()-1; flag=0; else if(flag=0) if(c=-1) wordEndPostion=inOne.getFilePointer(); else wordEndPostion=inOne.getFilePointer()-1; 【代码4】/ i

15、nTwo调用seek方法将读写位置移动到wordStarPostion byte cc=new byte(int)wordEndPostion-(int)wordStarPostion; 【代码5】/ inTwo调用readFully(byte a)方法，向a传递cc String word=new String(cc); allWorsd.add(word); if(!(noSameWord.contains(word) noSameWord.add(word); flag=1; inOne.close(); inTwo.close(); catch(Exception e) public

16、Vector getAllWorsd() return allWorsd; public Vector getNoSameWord() return noSameWord; RandomExample.javaimport java.awt.*;import java.awt.event.*;import java.util.Vector;import java.io.File;public class StatisticFrame extends Frame implements ActionListener WordStatistic statistic; TextArea showMes

17、sage; Button openFile; FileDialog openFileDialog; Vector allWord,noSameWord; public StatisticFrame() statistic=new WordStatistic(); showMessage=new TextArea(); openFile=new Button(Open File); openFile.addActionListener(this); add(openFile,BorderLayout.NORTH); add(showMessage,BorderLayout.CENTER); op

18、enFileDialog=new FileDialog(this,打开文件话框,FileDialog.LOAD); allWord=new Vector(); noSameWord=new Vector(); setSize(350,300); setVisible(true); addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) System.exit(0); ); validate(); public void actionPerformed(ActionEvent e) noSame

19、Word.clear(); allWord.clear(); showMessage.setText(null); openFileDialog.setVisible(true); String fileName=openFileDialog.getFile(); if(fileName!=null) statistic.wordStatistic(new File(fileName); allWord=statistic.getAllWorsd(); noSameWord=statistic.getNoSameWord(); showMessage.append(n+fileName+中有+

20、allWord.size()+个英文单词); showMessage.append(n其中有+noSameWord.size()+个互不相同英文单词); showMessage.append(n按使用频率排列：n); int count=new intnoSameWord.size(); for(int i=0;inoSameWord.size();i+) String s1=(String)noSameWord.elementAt(i); for(int j=0;jallWord.size();j+) String s2=(String)allWord.elementAt(j); if(s1

21、.equals(s2) counti+; for(int m=0;mnoSameWord.size();m+) for(int n=m+1;ncountm) String temp=(String)noSameWord.elementAt(m); noSameWord.setElementAt(String)noSameWord.elementAt(n),m); noSameWord.setElementAt(temp,n); int t=countm; countm=countn; countn=t; for(int m=0;mnoSameWord.size();m+) showMessag

22、e.append(n+(String)noSameWord.elementAt(m)+ :+countm+/+allWord.size()+ =+(1.0*countm)/allWord.size(); RandomExample.javapublic class StatisticMainClass public static void main(String args) new StatisticFrame(); 3 读取Zip文件（验证） ReadZipFile.javaimport java.io.*;import java.util.zip.*;public class ReadZi

23、pFile public static void main(String args) File f=new File(book.zip); File dir=new File(Book); byte b=new byte100; dir.mkdir(); try ZipInputStream in=new ZipInputStream(new FileInputStream(f); ZipEntry zipEntry=null; while(zipEntry=in.getNextEntry()!=null) File file=new File(dir,zipEntry.getName();

24、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.println(str); out.write(b,0,n); out.close(); in.close(); catch(IOException ee) System.out.println(ee); 参考答案1答案：【代码1】： new

25、 FileReader(file);【代码2】： new BufferedReader(inOne); 【代码3】： inTwo.readLine(); 【代码4】： new FileReader(helpFile); 【代码5】： new BufferedReader(inOne); 2答案【代码1】： new RandomAccessFile(file,rw);【代码2】： new RandomAccessFile(file,rw); 【代码3】： inOne.read(); 【代码4】： inTwo.seek(wordStarPostion); 【代码5】： inTwo.readFully(cc);