example20_6.java

不错的教程 适合中高级人员的使用

import  java.io.*;
import java.awt.*;
import java.awt.event.*;
class EWindow extends Frame implements ActionListener
{  TextArea text; 
   Button buttonRead,buttonWrite;
   BufferedReader bufferIn; 
   FileReader in;
   BufferedWriter bufferOut; 
   FileWriter out;
   EWindow()
   {  super("流的读取");
      text=new TextArea(10,10);text.setBackground(Color.cyan);
      buttonRead =new Button("读取"); 
      buttonRead.addActionListener(this);
      buttonWrite =new Button("写出"); 
      buttonWrite.addActionListener(this);
      setLayout(new BorderLayout());
      setSize(340,340);
      setVisible(true);
      add(text,BorderLayout.CENTER);
      Panel pNorth=new Panel();
      pNorth.add(buttonRead);pNorth.add(buttonWrite);
      pNorth.validate();
      add(BorderLayout.NORTH,pNorth);
      addWindowListener(new WindowAdapter()
                       {  public void windowClosing(WindowEvent e)
                            {  System.exit(0);
                            }
                       });
   } 
   public void actionPerformed(ActionEvent e)
   {  String s;
      if(e.getSource()==buttonRead)
       {  try{  text.setText(null);
                File f=new File("Example20_6.java");
                in=new FileReader(f);
                bufferIn=new BufferedReader(in);
                while((s=bufferIn.readLine())!=null)
                 {  text.append(s+'\n');   
                 }
                bufferIn.close();
                in.close();
             }
          catch(IOException exp){System.out.println(exp);} 
       }
      if(e.getSource()==buttonWrite)
       {  try {  File f=new File("Example20_6(out).java");
                 FileWriter out=new FileWriter(f);
                 BufferedWriter bufferOut=new BufferedWriter(out);
                 bufferOut.write(text.getText(),0,(text.getText()).length());
                 bufferOut.flush();
                 bufferOut.close();
                 out.close();
               }
          catch(IOException exp){  System.out.println(exp);}
       }
   }
}
public class Example20_6
{  public static void main(String args[])
   {  EWindow w=new EWindow();
      w.validate();
   }
}