Java2实用教程（第二版）程序代码——第二十章 输入输出流

  1 // 例子1
  2 import java.io. * ;
  3 class  Example20_1 
  4 {  public static void main(String args[])
  5   {  File f1=new  File("F:\\8000","Example20_1.java");
  6      File f2=new File("F:\\8000");
  7      System.out.println("文件Example20_1是可读的吗:"+f1.canRead());
  8      System.out.println("文件Example20_1的长度:"+f1.length());
  9      System.out.println("文件Example20_1的绝对路径:"+f1.getAbsolutePath());
 10      System.out.println("F:\\8000:是目录吗？"+f2.isDirectory());
 11   }
 12}
 13
 14 // 例子2
 15 import java.io. * ;
 16 class  FileAccept implements FilenameFilter 
 17 {  String str=null;
 18   FileAccept(String s)
 19   {  str="."+s;
 20   }
 21   public  boolean accept(File dir,String name)
 22   { return name.endsWith(str);
 23   }              
 24}
 25 public   class  Example20_2
 26 {  public static void main(String args[])
 27   {  File dir=new File("F:/8000");
 28      FileAccept acceptCondition=new FileAccept("java");
 29      String fileName[]=dir.list(acceptCondition);
 30      for(int i=0;i<5;i++)
 31           {  System.out.println(fileName[i]);
 32           }
 33   }
 34}
 35
 36 // 例子3
 37 import java.io. * ;import java.awt. * ;import java.awt. event . * ;
 38 class  Example20_3
 39 {  public static void main(String args[])
 40   {  int b;
 41      TextArea text;
 42      Frame window=new Frame();
 43      byte tom[]=new byte[25];
 44      window.setSize(100,100);text=new TextArea(10,16);
 45      window.setVisible(true);window.add(text,BorderLayout.CENTER);
 46      window.pack();
 47      window.addWindowListener(new WindowAdapter()
 48                         {  public void windowClosing(WindowEvent e)
 49                           {  System.exit(0);
 50                           }
 51                         }); 
 52   
 53      try{  File f=new File("F:\\8000","Example20_1.java");
 54            FileInputStream readfile=new FileInputStream(f);
 55            while((b=readfile.read(tom,0,25))!=-1) 
 56                {
 57                   String s=new String (tom,0,b);
 58                   System.out.println(s);
 59                   text.append(s); 
 60                }
 61            readfile.close();
 62         }
 63      catch(IOException e)
 64         {  System.out.println("File read Error");
 65         }
 66   }
 67}
 68
 69 // 例子4
 70 import java.io. * ;
 71 class  Example20_4
 72 {  public static void main(String args[])
 73   {  int b;
 74      byte buffer[]=new byte[100];
 75      try{  System.out.println("输入一行文本，并存入磁盘：");
 76            b=System.in.read(buffer);   //把从键盘敲入的字符存入buffer。
 77            FileOutputStream writefile=new FileOutputStream("line.txt");
 78            writefile.write(buffer,0,b);   // 通过流把 buffer写入到文件line.txt。
 79         }
 80      catch(IOException e)
 81         {  System.out.println("Error ");
 82         }
 83  }
 84}
 85
 86 // 例子5
 87 import java.io. * ;import java.awt. * ;import java.awt. event . * ;
 88 class  Example20_5
 89 {  public static void main(String args[])
 90   {  char a[]="今晚10点发起总攻".toCharArray();   
 91      int n=0,m=0;
 92      try{  File f=new File("F:\\8000","secret.txt");
 93            for(int i=0;i<a.length;i++)
 94               {  a[i]=(char)(a[i]^'R');
 95               }
 96            FileWriter out=new FileWriter(f);
 97            out.write(a,0,a.length);
 98            out.close();
 99            FileReader in=new FileReader(f);
100            int length=(int)f.length();
101            char tom[]=new char[length];
102            while((n=in.read(tom,0,length))!=-1) 
103                {  String s=new String (tom,0,n);
104                   m=n;   
105                   System.out.println("密文:"+s);
106                }
107            in.close();
108            for(int i=0;i<m;i++)
109               {  tom[i]=(char)(tom[i]^'R');
110               }
111            String 明文=new String(tom,0,m);
112            System.out.println("明文:"+明文);
113         }
114      catch(IOException e)
115         {  System.out.println("File read Error");
116         }
117   }
118}
119
120 // 例子6
121 import  java.io. * ;
122 import java.awt. * ;
123 import java.awt. event . * ;
124 class  EWindow extends Frame implements ActionListener
125 {  TextArea text; 
126   Button buttonRead,buttonWrite;
127   BufferedReader bufferIn; 
128   FileReader in;
129   BufferedWriter bufferOut; 
130   FileWriter out;
131   EWindow()
132   {  super("流的读取");
133      text=new TextArea(10,10);text.setBackground(Color.cyan);
134      buttonRead =new Button("读取"); 
135      buttonRead.addActionListener(this);
136      buttonWrite =new Button("写出"); 
137      buttonWrite.addActionListener(this);
138      setLayout(new BorderLayout());
139      setSize(340,340);
140      setVisible(true);
141      add(text,BorderLayout.CENTER);
142      Panel pNorth=new Panel();
143      pNorth.add(buttonRead);pNorth.add(buttonWrite);
144      pNorth.validate();
145      add(BorderLayout.NORTH,pNorth);
146      addWindowListener(new WindowAdapter()
147                       {  public void windowClosing(WindowEvent e)
148                            {  System.exit(0);
149                            }
150                       });
151   } 
152   public void actionPerformed(ActionEvent e)
153   {  String s;
154      if(e.getSource()==buttonRead)
155       {  try{  text.setText(null);
156                File f=new File("F:\\8000\\","E.java");
157                in=new FileReader(f);
158                bufferIn=new BufferedReader(in);
159                while((s=bufferIn.readLine())!=null)
160                 {  text.append(s+'\n');   
161                 }
162                bufferIn.close();
163                in.close();
164             }
165          catch(IOException exp){System.out.println(exp);} 
166       }
167      if(e.getSource()==buttonWrite)
168       {  try {  File f=new File("F:\\8000\\","E.java");
169                 FileWriter out=new FileWriter(f);
170                 BufferedWriter bufferOut=new BufferedWriter(out);
171                 bufferOut.write(text.getText(),0,(text.getText()).length());
172                 bufferOut.flush();
173                 bufferOut.close();
174                 out.close();
175               }
176          catch(IOException exp){  System.out.println(exp);}
177       }
178   }
179}
180 public   class  Example20_6
181 {  public static void main(String args[])
182   {  EWindow w=new EWindow();
183      w.validate();
184   }
185}
186
187 // 例子7
188 import java.util. * ;import java.io. * ;
189 import java.awt. * ;import java.awt. event . * ;
190 class  EWindow extends Frame implements ActionListener,ItemListener
191 {  String str[]=new String[7];String s;
192   FileReader file;
193   BufferedReader in;  
194   Button start,next;
195   Checkbox box[];
196   TextField 题目,分数;
197   int score=0; 
198   CheckboxGroup age=new CheckboxGroup();
199   EWindow()
200   {  super("英语单词学习");
201      分数=new TextField(10);题目=new TextField(70);
202      start=new Button("重新练习");start.addActionListener(this);
203      next=new Button("下一题目");next.addActionListener(this);
204      box=new Checkbox[4];
205      for(int i=0;i<=3;i++)
206       {  box[i]=new Checkbox("",false,age);
207          box[i].addItemListener(this); 
208       } 
209      try {  file=new FileReader("English.txt");
210             in=new BufferedReader(file);
211          }
212      catch(IOException e){}   
213      setBounds(100,100,400,320); setVisible(true);
214      setLayout(new GridLayout(4,1));
215      setBackground(Color.pink);
216      Panel p1=new Panel(),p2=new Panel(),
217      p3=new Panel() ,p4=new Panel(),p5=new Panel();
218      p1.add(new Label("题目:"));p1.add(题目);
219      p2.add(new Label("选择答案：")); 
220      for(int i=0;i<=3;i++)
221           {  p2.add(box[i]);
222           } 
223      p3.add(new Label("您的得分:"));p3.add(分数);
224      p4.add(start); p4.add(next);
225      add(p1); add(p2);add(p3); add(p4);
226      addWindowListener(new WindowAdapter()
227                        {public void windowClosing(WindowEvent e)
228                           {  System.exit(0); 
229                           }
230                        });
231     reading();
232   } 
233   public void reading()
234   {   int i=0; 
235       try { s=in.readLine();
236             if(!(s.startsWith("endend")))
237                 {  StringTokenizer tokenizer=new StringTokenizer(s,"#"); 
238                    while(tokenizer.hasMoreTokens())
239                        {  str[i]=tokenizer.nextToken();
240                           i++;
241                        }
242                     题目.setText(str[0]);
243                     for(int j=1;j<=4;j++)
244                       {  box[j-1].setLabel(str[j]);
245                       } 
246                  }
247              else if(s.startsWith("endend"))
248                  {  题目.setText("学习完毕"); 
249                     for(int j=0;j<4;j++)
250                       {  box[j].setLabel("end"); 
251                          in.close();file.close();
252                       } 
253                  }
254            }
255         catch(Exception exp){ 题目.setText("无试题文件") ; } 
256   }
257   public void actionPerformed(ActionEvent event)
258   {  if(event.getSource()==start)
259         {  score=0;
260            分数.setText("得分： "+score);
261            try {  file=new FileReader("English.txt");
262                   in=new BufferedReader(file);
263                }
264            catch(IOException e){}  
265            reading(); 
266         }
267      if(event.getSource()==next)
268         {  reading();
269            for(int j=0;j<4;j++)
270             { 
271               box[j].setEnabled(true);  
272             }
273         }
274   }
275   public void itemStateChanged(ItemEvent e)
276   {  for(int j=0;j<4;j++)
277        { if(box[j].getLabel().equals(str[5])&&box[j].getState())
278             {  score++;
279                分数.setText("得分： "+score);
280             }
281          box[j].setEnabled(false);  
282        }
283   }
284}
285 public   class  Example20_7
286 {   public static void main(String args[])
287    {  EWindow w=new EWindow();
288       w.pack();
289    }
290}
291
292 // 例子8
293 import java.awt. * ;import java.io. * ;
294 import java.awt. event . * ;
295 public   class  Example20_8
296 {  public static void main(String args[])
297    {  FileWindows win=new FileWindows();
298    }
299}
300 class   FileWindows extends Frame implements ActionListener
301 {   FileDialog filedialog_save,filedialog_load;//声明2个文件对话筐
302    MenuBar menubar;
303    Menu menu;
304    MenuItem itemOpen,itemSave;
305    TextArea text;
306    BufferedReader in;  
307    FileReader file_reader;
308    BufferedWriter out; 
309    FileWriter tofile;
310    FileWindows()
311    {  super("带文件对话框的窗口");     
312       setSize(260,270);               
313       setVisible(true);    
314       menubar=new MenuBar();   
315       menu=new Menu("文件"); 
316       itemOpen=new MenuItem("打开文件");
317       itemSave=new MenuItem("保存文件"); 
318       itemOpen.addActionListener(this); 
319       itemSave.addActionListener(this);
320       menu.add(itemOpen);
321       menu.add(itemSave); 
322       menubar.add(menu);  
323       setMenuBar(menubar);        
324       filedialog_save=new FileDialog(this,"保存文件话框",FileDialog.SAVE);
325       filedialog_load=new FileDialog(this,"打开文件话框",FileDialog.LOAD);
326       filedialog_save.addWindowListener(new WindowAdapter()
327                                  {public void windowClosing(WindowEvent e)
328                                       {  filedialog_save.setVisible(false);
329                                       }
330                                  });
331      filedialog_load.addWindowListener(new WindowAdapter()//对话框增加适配器
332                                  {public void windowClosing(WindowEvent e)
333                                       {  filedialog_load.setVisible(false);
334                                       }
335                                  });
336     addWindowListener(new WindowAdapter() 
337                                  {public void windowClosing(WindowEvent e)
338                                       {  System.exit(0);}
339                                       });
340    text=new TextArea(10,10);
341    add(text,BorderLayout.CENTER);
342  }
343  public void actionPerformed(ActionEvent e) 
344  {  if(e.getSource()==itemOpen)
345       {  filedialog_load.setVisible(true);
346          text.setText(null);
347          String s;
348          if(filedialog_load.getFile()!=null)
349             {
350                try{  File file= new  
351                      File(filedialog_load.getDirectory(),filedialog_load.getFile());
352                      file_reader=new FileReader(file);
353                      in=new BufferedReader(file_reader);
354                      while((s=in.readLine())!=null)
355                           text.append(s+'\n'); 
356                      in.close();
357                      file_reader.close();
358                   }
359               catch(IOException e2){}
360             }
361        }
362     else if(e.getSource()==itemSave)
363        {  filedialog_save.setVisible(true);
364            if(filedialog_save.getFile()!=null)
365              {
366                try {
367                       File file=new
368                       File(filedialog_save.getDirectory(),filedialog_save.getFile());
369                       tofile=new FileWriter(file);
370                       out=new BufferedWriter(tofile);
371                       out.write(text.getText(),0,(text.getText()).length());
372                       out.flush();
373                       out.close();
374                       tofile.close();
375                     }
376                catch(IOException e2){}
377              }
378        }
379   } 
380}
381
382 // 例子9
383 import java.awt. * ;import java.io. * ;
384 import java.awt. event . * ;
385 public   class  Example20_9
386 {  public static void main(String args[])
387   {  try{
388            Runtime ce=Runtime.getRuntime();
389            ce.exec("java Example20_8");
390            File file=new File("c:/windows","Notepad.exe");
391            ce.exec(file.getAbsolutePath());
392         }
393      catch(Exception e){} 
394   } 
395}
396
397 // 例子10
398 import java.io. * ;
399 public   class  Example20_10
400 {   public static void main(String args[])
401    {  RandomAccessFile in_and_out=null;
402       int data[]={1,2,3,4,5,6,7,8,9,10};
403       try{  in_and_out=new RandomAccessFile("tom.dat","rw");
404          }
405       catch(Exception e){}
406       try{  for(int i=0;i<data.length;i++)
407               {  in_and_out.writeInt(data[i]);
408               } 
409             for(long i=data.length-1;i>=0;i--) //一个int型数据占4个字节，我们从
410               {  in_and_out.seek(i*4); //文件的第36个字节读取最后面的一个整数，
411                  //每隔4个字节往前读取一个整数：
412                  System.out.print(","+in_and_out.readInt());
413               }
414             in_and_out.close();
415          }
416       catch(IOException e){} 
417    }
418}
419
420 // 例子11
421 import  java.io. * ;
422 class  Example20_11 
423 {  public static void main(String args[])
424   {  try{  RandomAccessFile in=new RandomAccessFile("Example20_11.java","rw");
425            long filePoint=0;
426            long fileLength=in.length();
427            while(filePoint<fileLength)
428                 {  String s=in.readLine();
429                    System.out.println(s);
430                    filePoint=in.getFilePointer();
431                 }
432            in.close();
433         }
434      catch(Exception e){}
435   }
436}
437
438 // 例子12
439 import java.io. * ;
440 import javax.swing. * ;
441 import java.awt. * ;import 
442 java.awt. event . * ;
443 import javax.swing.border. * ;
444 class  InputArea extends Panel 
445 implements ActionListener
446 {  File f=null;
447   RandomAccessFile out;
448   Box baseBox ,boxV1,boxV2; 
449   TextField name,email,phone;
450   Button button;
451   InputArea(File f)
452   {   setBackground(Color.cyan);
453       this.f=f;
454       name=new TextField(12);
455       email=new TextField(12); 
456       phone=new TextField(12);
457       button=new Button("录入");
458       button.addActionListener(this);
459       boxV1=Box.createVerticalBox();
460       boxV1.add(new Label("输入姓名"));
461       boxV1.add(Box.createVerticalStrut(8));
462       boxV1.add(new Label("输入email"));
463       boxV1.add(Box.createVerticalStrut(8));
464       boxV1.add(new Label("输入电话"));
465       boxV1.add(Box.createVerticalStrut(8));
466       boxV1.add(new Label("单击录入"));
467       boxV2=Box.createVerticalBox();
468       boxV2.add(name);
469       boxV2.add(Box.createVerticalStrut(8));
470       boxV2.add(email);
471       boxV2.add(Box.createVerticalStrut(8));
472       boxV2.add(phone);
473       boxV2.add(Box.createVerticalStrut(8));
474       boxV2.add(button);
475       baseBox=Box.createHorizontalBox();
476       baseBox.add(boxV1);
477       baseBox.add(Box.createHorizontalStrut(10));
478       baseBox.add(boxV2);
479       add(baseBox); 
480   }
481   public void actionPerformed(ActionEvent e)
482   {  try{
483           RandomAccessFile out=new RandomAccessFile(f,"rw");
484           if(f.exists())
485              {  long length=f.length();
486                 out.seek(length);
487              }
488           out.writeUTF("姓名:"+name.getText());
489           out.writeUTF("eamil:"+email.getText());
490           out.writeUTF("电话:"+phone.getText());
491           out.close();
492         }
493       catch(IOException ee){}
494   }
495}
496
497 public   class  Example20_12 extends Frame implements ActionListener
498 {  File file=null;
499   MenuBar bar;
500   Menu fileMenu;
501   MenuItem 录入,显示;
502   TextArea show;
503   InputArea inputMessage;
504   CardLayout card=null; //卡片式布局.
505   Panel pCenter;
506   Example20_12()
507   { 
508       file=new File("通讯录.txt");
509       录入=new MenuItem("录入");
510       显示=new MenuItem("显示");
511       bar=new MenuBar();
512       fileMenu=new Menu("菜单选项");
513       fileMenu.add(录入);
514       fileMenu.add(显示);
515       bar.add(fileMenu);
516       setMenuBar(bar);
517       录入.addActionListener(this);
518       显示.addActionListener(this);
519       inputMessage=new InputArea(file);
520       show=new TextArea(12,20); 
521       card=new CardLayout();
522       pCenter=new Panel();
523       pCenter.setLayout(card);
524       pCenter.add("录入",inputMessage);
525       pCenter.add("显示",show);
526
527       add(pCenter,BorderLayout.CENTER);
528       addWindowListener(new WindowAdapter()
529                    { public void windowClosing(WindowEvent e)
530                       {
531                          System.exit(0);
532                         }
533                    });
534      setVisible(true);
535      setBounds(100,50,420,380);
536      validate();
537   }
538   public void actionPerformed(ActionEvent e)
539   {
540     if(e.getSource()==录入)
541       {
542         card.show(pCenter,"录入");
543       }
544     else if(e.getSource()==显示)
545       { int number=1;
546         card.show(pCenter,"显示");
547         try{  RandomAccessFile in=new RandomAccessFile(file,"r");
548               String 姓名=null; 
549               while((姓名=in.readUTF())!=null)   
550                  {  show.append("\n"+number+" "+姓名);
551                     show.append(in.readUTF());  //读取email.
552                     show.append(in.readUTF());  //读取phone
553                     show.append("\n------------------------- ");
554                     number++;
555                  }
556               in.close();
557             }
558         catch(Exception ee){}
559       }
560   }
561   public static void main(String args[])
562   {  new Example20_12();
563   }
564}
565
566 // 例子13
567 import java.io. * ;
568 public   class  Example20_13
569 {  public static void main(String args[])
570   {  try  
571        {  FileOutputStream fos=new FileOutputStream("jerry.dat");
572           DataOutputStream out_data=new DataOutputStream(fos);
573           out_data.writeInt(100);out_data.writeInt(10012);
574           out_data.writeLong(123456);  
575           out_data.writeFloat(3.1415926f); out_data.writeFloat(2.789f);
576           out_data.writeDouble(987654321.1234);
577           out_data.writeBoolean(true);out_data.writeBoolean(false);
578           out_data.writeChars("i am ookk");
579         } 
580       catch(IOException e){}
581       try
582         {  FileInputStream fis=new FileInputStream("jerry.dat");
583            DataInputStream in_data=new DataInputStream(fis);
584            System.out.println(":"+in_data.readInt());//读取第1个int整数。
585            System.out.println(":"+in_data.readInt());//读取第2个int整数。
586            System.out.println(":"+in_data.readLong()); //读取long整数 。
587            System.out.println(":"+in_data.readFloat());//读取第1个float数。
588            System.out.println(":"+in_data.readFloat());//读取第2个float数。
589            System.out.println(":"+in_data.readDouble()); 
590            System.out.println(":"+in_data.readBoolean());//读取第1个boolean。
591            System.out.println(":"+in_data.readBoolean());//读取第2个boolean。
592            char c;
593            while((c=in_data.readChar())!='\0')     //'\0'表示空字符。
594                  System.out.print(c);
595          } 
596        catch(IOException e){}
597   }
598}
599
600 // 例子14
601 import java.awt. * ;import java.awt. event . * ;
602 import java.io. * ;
603 public   class  Example20_14 extends Frame implements ActionListener
604 {  TextArea text=null; Button 读入=null,写出=null;
605   FileInputStream file_in=null; FileOutputStream file_out=null;
606   ObjectInputStream object_in=null;                  //对象输入流。
607   ObjectOutputStream object_out=null;               //对象输出流。
608   Example20_14()
609   {  setLayout(new FlowLayout()); text=new TextArea(6,10);
610      读入=new Button("读入对象");  写出=new Button("写出对象");
611      读入.addActionListener(this);写出.addActionListener(this);
612      setVisible(true); add(text);add(读入);add(写出);
613      addWindowListener(new WindowAdapter()
614                   {  public void windowClosing(WindowEvent e)
615                            {  System.exit(0);
616                            }
617                   });
618       pack();setSize(300,300);
619   }
620   public void actionPerformed(ActionEvent e)
621   {  if(e.getSource()==写出)
622         {  try{  file_out=new FileOutputStream("tom.txt");
623                  object_out=new ObjectOutputStream(file_out);//创建对象输出流。
624                  object_out.writeObject(text);                //写对象到文件中。
625                  object_out.close();
626                }
627            catch(IOException event){}
628          }
629       else if(e.getSource()==读入)
630         {  try{  file_in=new FileInputStream("tom.txt");
631                  object_in=new ObjectInputStream(file_in);    //创建对象输入流。
632                  TextArea temp=(TextArea)object_in.readObject();//从文件中读入对象。
633                  temp.setBackground(Color.pink); this.add(temp);//添加该对象到窗口。
634                  this.pack();this.setSize(600,600);
635                  object_in.close();
636                }
637             catch(ClassNotFoundException event)
638               {  System.out.println("不能读出对象");
639               }
640             catch(IOException event)
641               {  System.out.println("can not read file");
642               }
643         }
644   }
645   public static void main(String args[])
646   {  Example20_14 win=new Example20_14();
647   }
648}
649
650 // 例子15
651 import java.io. * ;
652 class  Student implements Serializable // 实现接口Serializable的Student类。
653 {  String name=null;double height; 
654   Student(String name,double height)
655   {  this.name=name;this.height=height;
656   }
657   public void setHeight (double c)
658   {  this.height=c;
659   }
660}
661 public   class  Example20_15
662 {  public static void main(String args[])
663   {  Student zhang=new Student("zhang ping",1.65);
664      try{  FileOutputStream    file_out=new FileOutputStream("s.txt");
665        ObjectOutputStream object_out=new ObjectOutputStream(file_out);
666        object_out.writeObject(zhang);  
667        System.out.println(zhang.name+"的身高是："+zhang.height); 
668            FileInputStream file_in=new FileInputStream("s.txt");
669            ObjectInputStream object_in=new ObjectInputStream(file_in);
670        zhang=(Student)object_in.readObject();
671            zhang.setHeight(1.78); //修改身高。
672            System.out.println(zhang.name+"现在的身高是："+zhang.height);
673      }
674       catch(ClassNotFoundException event)
675          {  System.out.println("不能读出对象");
676          }
677       catch(IOException event)
678 {  System.out.println("can not read file"+event);
679 }
680   }
681}
682
683 // 例子16
684 import java.awt. * ;import java.io. * ;import java.awt. event . * ;
685 public   class  Example20_16
686 {  public static void main(String args[])
687   {  JDK f=new JDK();
688      f.pack();
689      f.addWindowListener(new WindowAdapter()  //窗口增加适配器。
690                   {public void windowClosing(WindowEvent e)
691                          {  System.exit(0);
692                          }
693                    });
694      f.setBounds(100,120,700,360);
695      f.setVisible(true);
696   }
697}
698 class   JDK extends Frame implements ActionListener,Runnable
699 {  Thread compiler=null;  //负责编译的线程。
700   Thread run_prom=null; //负责运行程序的线程。
701   boolean bn=true;
702   CardLayout mycard;
703   Panel p=new Panel();
704   File file_saved=null;
705   TextArea input_text=new TextArea(),//程序输入区。
706   compiler_text=new TextArea(),     //编译出错显示区。
707   dos_out_text=new TextArea();      //程序运行时，负责显示在dos窗口的输出信息。
708   Button button_input_text,button_compiler_text,
709   button_compiler,button_run_prom,button_see_doswin;
710   TextField input_flie_name_text=new TextField("输入被编译的文件名字.java");
711   TextField run_file_name_text=new TextField("输入应用程序主类的名字");
712   JDK()
713   {  super("Java编程小软件");
714      mycard=new CardLayout();
715      compiler=new Thread(this);
716      run_prom=new Thread(this);
717      button_input_text=new Button("程序输入区(白色)");
718      button_compiler_text=new Button("编译结果区(粉色)");
719      button_compiler=new Button("编译程序");
720      button_run_prom=new Button("运行应用程序");
721      button_see_doswin=new  Button("查看应用程序运行时在dos窗口输出的信息");
722      p.setLayout(mycard);
723      p.add("input",input_text);p.add("compiler",compiler_text);
724      p.add("dos",dos_out_text);
725      add(p,"Center");
726      add( button_see_doswin,"South"); 
727      compiler_text.setBackground(Color.pink);
728      dos_out_text.setBackground(Color.blue);
729      Panel p1=new Panel();p1.setLayout(new GridLayout(4,2));
730      p1.add(new Label("按扭输入源程序："));p1.add(button_input_text);
731      p1.add(new Label("按扭看编译结果："));p1.add(button_compiler_text); 
732      p1.add(input_flie_name_text);  p1.add(button_compiler);
733      p1.add(run_file_name_text); p1.add(button_run_prom);
734      add(p1,BorderLayout.NORTH); 
735      button_input_text.addActionListener(this);
736      button_compiler_text.addActionListener(this);
737      button_compiler.addActionListener(this); 
738      button_run_prom.addActionListener(this);
739      button_see_doswin.addActionListener(this);
740   }
741   public void actionPerformed(ActionEvent e) 
742   {  if(e.getSource()==button_input_text)
743        {  mycard.show(p,"input");
744        }
745      else if(e.getSource()==button_compiler_text)
746       {  mycard.show(p,"compiler");
747       }
748      else if(e.getSource()==button_see_doswin)
749       {  mycard.show(p,"dos");
750       }
751      else if(e.getSource()==button_compiler)
752      {   if(!(compiler.isAlive()))
753             {  compiler=new Thread(this);
754             }
755          try{  compiler.start();
756             }
757          catch(Exception eee){}
758          mycard.show(p,"compiler");
759      }
760     else if(e.getSource()==button_run_prom)
761     {  if(!(run_prom.isAlive()))
762             {  run_prom =new Thread(this);
763             }
764          try{  run_prom.start();
765             }
766          catch(Exception eee){} 
767        mycard.show(p,"dos");
768     }
769   }
770   public void run()
771   {  if(Thread.currentThread()==compiler)
772        {  compiler_text.setText(null);   
773           String temp=input_text.getText().trim(); 
774           byte buffer[]=temp.getBytes(); 
775           int b=buffer.length;
776           String flie_name=input_flie_name_text.getText().trim();
777           try{  file_saved=new File(flie_name);
778                 FileOutputStream writefile=new FileOutputStream(file_saved);
779                 writefile.write(buffer,0,b);writefile.close();
780              }
781           catch(IOException e5)
782             {  System.out.println("Error ");
783             }
784          try{  Runtime ce=Runtime.getRuntime();
785                InputStream in=
786                 ce.exec("javac "+flie_name).getErrorStream();
787                BufferedInputStream bin=new BufferedInputStream(in);
788                byte shuzu[]=new byte[100];
789                int n;boolean bn=true;
790                while((n=bin.read(shuzu,0,100))!=-1)
791                   {  String s=null;
792                      s=new String(shuzu,0,n);
793                      compiler_text.append(s);
794                      if(s!=null) bn=false;
795                    }
796                if(bn) 
797                    {  compiler_text.append("编译正确"); 
798                    } 
799             } 
800           catch(IOException e1){} 
801       }
802      else if(Thread.currentThread()==run_prom)
803       {   dos_out_text.setText(null);
804           try{  Runtime ce=Runtime.getRuntime();
805                 String path=run_file_name_text.getText().trim();
806                 InputStream in=ce.exec("java  "+path).getInputStream();
807                 BufferedInputStream bin=new BufferedInputStream(in);
808                 byte zu[]=new byte[150];
809                 int m;String s=null;
810                 while((m=bin.read(zu,0,150))!=-1)
811                    {  s=new String(zu,0,m);
812                       dos_out_text.append(s);
813                    }
814                } 
815            catch(IOException e1){} 
816        } 
817   }
818}
819