import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;



public class SendPara {

    public static void main(String[] args) {
        JFrame jf = new JFrame();
        jf.setSize(400,300);
        jf.add(new Pane1());
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);
    }

}

class Pane1 extends JPanel implements ActionListener{
    private JLabel jlb1;
    public Pane1(){
        jlb1 = new JLabel("");
        JButton jbt1 = new JButton("打开A");
        setLayout(new BorderLayout());
        jbt1.addActionListener(this);
        add(jlb1,BorderLayout.CENTER);
        add(jbt1,BorderLayout.SOUTH);
    }
    
    public void setLabelText(String message){
        jlb1.setText(message);
    }

    public void actionPerformed(ActionEvent e) {
        A a = new A(this);
        a.setVisible(true);
    }
}

class A extends JDialog implements ActionListener{
    private Pane1 _pan1;
    private JTextField jt1;
    public A(Pane1 pan1){
        super((JFrame)null,true);
        setSize(400,300);
        _pan1 = pan1;
        jt1 = new JTextField();
        JButton jbt1 = new JButton("确定");
        jbt1.addActionListener(this);
        
        setLayout(new BorderLayout());
        add(jt1,BorderLayout.CENTER);
        add(jbt1,BorderLayout.SOUTH);
    }
    
    public void actionPerformed(ActionEvent e) {
        _pan1.setLabelText(jt1.getText());
        dispose();
    }
    
    
}