usetextarea.java

Java语言

import java.awt.*;
import java.awt.event.*;
public class UseTextArea{
   public static void main(String args[]){
	MyFrame f=new MyFrame();
	f.setSize(330,300);
	f.setBackground(Color.lightGray);
	f.setLayout(new FlowLayout());
	f.show();
   }
}
class MyFrame extends Frame implements TextListener{
	TextArea ta1,ta2;
	public MyFrame(){
	   super("my frame");
	   ta1=new TextArea(5,20);
	   ta2=new TextArea(5,20);
	   ta1.addTextListener(this);	
	   setLayout(new FlowLayout());
	   add(ta1); add(ta2);
	   this.addWindowListener(new WindowAdapter(){
              public void windowClosing(WindowEvent e){
			dispose();
			System.exit(0);
	      }});
	}
   public void textValueChanged(TextEvent e){
      if(e.getSource()==ta1)
	ta2.setText(ta1.getText());
   }
}