testjoptionpane1.java

java2 primer plus一书源程序

/*
 * TestJOptionPane1.java
 *
 * Created on September 5, 2002, 4:34 PM
 */

package ch17;

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


/**
 *
 * @author  Stephen Potts
 */
public class TestJOptionPane1 extends JFrame implements ActionListener
{
    JOptionPane op;
    JTextArea ta;
    JButton btnEnter;
    
    /** Creates a new instance of TestJOptionPane1 */
    public TestJOptionPane1()
    {
        op = new JOptionPane("What is your name?", 
                              JOptionPane.QUESTION_MESSAGE,
                              JOptionPane.OK_CANCEL_OPTION, null);
        op.setSelectionValues(null);
        op.setWantsInput(true);
        
        ta = new JTextArea(5, 30);
        ta.setText("");
        JPanel p1 = new JPanel();
        
        p1.add(ta);
        
        btnEnter = new JButton("Enter Your Name");
        btnEnter.addActionListener(this);
        JPanel p2 = new JPanel();
        p2.add(btnEnter);
        
        JPanel cp = (JPanel)getContentPane();
        cp.setLayout(new BorderLayout());
        cp.add(p1, BorderLayout.NORTH);
        cp.add(p2, BorderLayout.SOUTH);
        
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 400, 200);
        setVisible(true);
        setTitle("Using a JOptionPane");

    }
    
    public void actionPerformed(ActionEvent ae)
    {
        Container parent = btnEnter.getParent();
        JDialog jd = op.createDialog(parent, "Save");
        jd.show();
        String filename = (String) op.getInputValue();
        System.out.println("You entered " + filename);
        ta.setText("You entered " + filename);

    }
    
    public static void main(String[] args)
    {
        TestJOptionPane1 top1 = new TestJOptionPane1();
    }
    
}