mainframe.java

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package dd;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MainFrame extends JFrame
                       implements ActionListener
{
	private JLabel lblName;
	private JButton btnShow;
	
	public MainFrame()
	{
		lblName = new JLabel("请输入您的姓名.");
		btnShow = new JButton("显示小窗口");
		
		java.awt.Container cp = this.getContentPane();
		cp.add(lblName,BorderLayout.CENTER);
		cp.add(btnShow, BorderLayout.SOUTH);
		
		btnShow.addActionListener(this);
		
		this.setTitle("main frame");
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(600, 400);
		this.setVisible(true);
	}
	
	public void displayName(String name)
	{
		lblName.setText("您的姓名是：" + name);
	}
	
	public void actionPerformed(ActionEvent ae)
	{
		new SubFrame(this);  //将主窗口的引用传递给小窗口的构造方法
	}
}