Swing中让frame置于屏幕中央的实现方法,及添加图标

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

import javax.swing.JFrame;


public class CenterFrame extends JFrame{
	private static final long serialVersionUID = 1L;
	public static void main(String[] str){
		new CenterFrame().setVisible(true);
	}
	public CenterFrame() {
		  //取屏幕大小
		  Toolkit kit = Toolkit.getDefaultToolkit();
		  Dimension screenSize = kit.getScreenSize();
		  int screenHeight = screenSize.height;
		  int screenWidth = screenSize.width;
		  
		  //置于屏幕中央
		  setSize(screenWidth/2, screenHeight/2);
		  setLocation(screenWidth/4, screenHeight/4);
		  
		  //添加图标
		  Image img = kit.getImage("icon.gif");
		  setIconImage(img);
		  setTitle("CenterFrame");
		}

}