javax.swing

01.import java.awt.*;   
02.import javax.swing.*;   
03.  
04.public class TestJFrame {   
05.    public static void main(String[] args) {   
06.        MyFrame mf = new MyFrame("我的第一个窗口");   
07.    }   
08.}   
09.  
10.class MyFrame extends JFrame {   
11.    Container p;   
12.    public MyFrame() {   
13.    }   
14.    public MyFrame(String title) {   
15.        super(title);  //设置窗体标题   
16.        p = getContentPane();   
17.        setSize(500, 500);  //设置窗体大小   
18.        centerOnScreen();   //窗体在屏幕中间显示   
19.        setIconImage(new ImageIcon("mm.jpg").getImage());  //设置窗体图标   
20.        p.setBackground(new Color(165, 79, 90));  //设置窗体背景色   
21.        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);   //设置关闭按钮操作   
22.        setVisible(true);   //设置窗体可见   
23.    }   
24.       
25.    public void centerOnScreen() {   
26.        Dimension displaySize = getToolkit().getScreenSize();   
27.        Dimension winSize = getSize();   
28.        int x = (displaySize.width - winSize.width) / 2;   
29.        int y = (displaySize.height - winSize.height) / 2;   
30.        if(x < 0) {   
31.            x = 0;   
32.        }   
33.        if(y < 0) {   
34.            y = 0;   
35.        }   
36.        setLocation(x, y);   
37.    }   
38.}  

　　文章转载自CSDN :http://blog.csdn.net/tsyj810883979/article/details/6494431