Java键盘事件监听(2)

package com.han;

import java.awt.Container;
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

/**
* 键盘事件监听(2)
* @author HAN
*
*/
public class KeyEvent_2 extends JFrame {

/**
*
*/
private static final long serialVersionUID = 8599016812375478424L;

public KeyEvent_2() {
// TODO Auto-generated constructor stub
Container container = getContentPane();
container.setLayout(new FlowLayout());
JLabel label = new JLabel("实现只允许输入数字的文本框：");
JTextField textField = new DigitOnlyField(10);
container.add(label);
container.add(textField);

}

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
KeyEvent_2 frame = new KeyEvent_2();
frame.setTitle("实现只允许输入数字的文本框");
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}