10例子26.txt

来自「Java大学实用教程 耿祥义编著 课件 PPT」· 文本 代码 · 共 42 行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Win extends JFrame implements KeyListener
{  
    JTextField text[]=new JTextField[3];
    Container con; 
    Win()
    { 
        con=getContentPane();
        con.setLayout(new FlowLayout());
        for(int i=0;i<3;i++) 
         { 
            text[i]=new JTextField(12);
            text[i].addKeyListener(this);
            con.add(text[i]);
         }
      text[0].requestFocusInWindow();
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      setBounds(10,10,300,300);
      setVisible(true); 
      validate();
    }
    public void keyPressed(KeyEvent e)
    { 
       JTextField text=(JTextField)e.getSource();
       if(text.getCaretPosition()>=6)
        {
           text.transferFocus(); 
        }
    }
    public void keyTyped(KeyEvent e) {}
    public void keyReleased(KeyEvent e) {}
}
public class Example
{ 
    public static void main(String args[])
    { 
       Win win=new Win();
    }
}