textdemo.java

本人在JAVA学习中的一点小实验

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TextDemo extends JFrame{
	
	JTextField jt1,jt2;
	public TextDemo(String title ){
	 jt1=new JTextField();
	 jt2=new JTextField();
	 Container cp=getContentPane();
	cp.setLayout(new BorderLayout());
	 cp.add(jt1,BorderLayout.NORTH);
	 cp.add(jt2,BorderLayout.SOUTH );
	    setSize(400,100);
	 	setVisible(true);
	 	setLocation(200,200);
	 	setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	 
	 AL listener=new AL();
	 jt1.addActionListener(listener);
	  setSize(400,100);
	  setVisible(true);
	  setLocation(200,200);
	  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	 		
	}
	class AL implements ActionListener {
		public void actionPerformed (ActionEvent e){
		 if((JTextField)e.getSource()==jt1)	
		jt2.setText(jt1.getText());
		}
	 	
	 }
	 public static void main(String args[]){
	 	TextDemo mm=new TextDemo("textDemo");
	
	 	
	 }
	 }