Java GUI之FlowLayout.CENTER

package com.sinosuperman.driver;

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

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

public class MainBench {
	public static void main(String[] args) {
		MyFrame frame = new MyFrame();
		frame.setVisible(true);
	}
}

class MyFrame extends JFrame {
	private static final long serialVersionUID = 1L;
	private JButton okButton, exitButton;
	Toolkit tk = Toolkit.getDefaultToolkit();
	Dimension d = tk.getScreenSize();
	public MyFrame() {
		this.setLayout(new FlowLayout(FlowLayout.CENTER));
		this.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		this.setSize((int) d.getWidth() / 2, (int) d.getHeight() / 2);
		this.setLocation((int) (d.getWidth() - this.getWidth()) / 2, (int) (d.getHeight() - this.getHeight()) / 2);
		okButton = new JButton();
		exitButton = new JButton();
		okButton.setText("OK");
		exitButton.setText("Exit");
		this.add(okButton);
		this.add(exitButton);
	}
}