Java GUI之建立一個只有兩個按鈕的框架

package com.sinosuperman.driver;

import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class MainBench {
	public static void main(String[] args) {
		
		JFrame frame = new TwoButtonFrame();
		JPanel panel = new TwoButtonPanel();
		
		frame.add(panel);
		frame.setVisible(true);
	}
}

class TwoButtonPanel extends JPanel {
	
	private static final long serialVersionUID = 1L;
	
	private JButton okButton;
	private JButton exitButton;
	
	public TwoButtonPanel() {
		
		okButton = new JButton("OK");
		exitButton = new JButton("Exit");
		
		this.add(okButton);
		this.add(exitButton);
	}
}

class TwoButtonFrame extends JFrame {
	
	private static final long serialVersionUID = 1L;
	
	Toolkit tk = Toolkit.getDefaultToolkit();
	Dimension d = tk.getScreenSize();
	
	JPanel panel;
	
	public TwoButtonFrame() {
	
		panel = new TwoButtonPanel();
		
		this.setSize((int) d.getWidth() / 2, (int) d.getHeight() / 2);
		this.setLocation((int) (d.getWidth() - getWidth()) / 2, (int) (d.getHeight() - getHeight()) / 2);
		
		this.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		this.setResizable(false);
		
		this.add(panel);
	}
}