ch9_34.java

来自「java图形用户界面设计 包括如何创建窗体 设计界面 管理布局 绘制图形 」· Java 代码 · 共 45 行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ch9_34 extends JFrame
{
	public ch9_34()
	{
		setBounds(20,20,500,300);
		getContentPane().setLayout(null);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);              
	}
	public static void main(String [] args)
	{
		ch9_34 f=new ch9_34();
		f.getContentPane().setLayout(new BorderLayout());
		
		JPanel p1=new JPanel();
		p1.setLayout(new GridLayout(2,2));
		p1.setBorder(BorderFactory.createTitledBorder("事件处理范例"));
		JLabel l1=new JLabel("输入:");
		JLabel l2=new JLabel("输入后,按enter==>");
		final JLabel l3=new JLabel("");
		final JPasswordField t1=new JPasswordField();
		t1.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				final char [] thestr=t1.getPassword();
				final String str=new String(thestr);
				l3.setText(str);
			}	
		});
		p1.add(l1);
		p1.add(t1);
		p1.add(l2);
		p1.add(l3);
		f.getContentPane().add(p1);
		f.pack();
		f.show();
	}
}