newdialog.java

Java 开发的弹跳球小游戏代码. 便于理解OO的概念.

import java.awt.*;
import java.awt.event.*;

/** 
 * Dialog box asking for new game.
 */
public class NewDialog extends Dialog 
{    
    public String choice = "No";
        
    private Button yes, no;
    
    public NewDialog (Frame frm, boolean modal) {
        super(frm, modal);
                
        setLayout(new FlowLayout());
        // setSize(160, 100); // Omitted for cross-platform success
        
        add(new Label("Start a new game?"));
        
        yes = new Button("Yes");
        add(yes);
        yes.addActionListener(new ActionListener () {
            public void actionPerformed (ActionEvent e) {
                choice = "Yes";
                dispose();
            }});
        
        no = new Button("No");
        add(no);
        no.addActionListener(new ActionListener () {
            public void actionPerformed (ActionEvent e) {
                choice = "No";
                dispose();
            }});
    
        pack();
    }
}