package Com.MySwing;

 import java.awt.BorderLayout;

 import java.awt.EventQueue;

 import javax.swing.JFrame;

 import javax.swing.JLabel;

 import javax.swing.JPanel;

 public class NineSwing extends JFrame {

     private static final long serialVersionUID = -2085588912441845548L;

     private JPanel contentPane;

     public static void main(String[] args) {

         EventQueue.invokeLater(new Runnable() {

             public void run() {

                 try {

                     NineSwing frame = new NineSwing();

                     frame.setVisible(true);

                 } catch (Exception e) {

                     e.printStackTrace();

                 }

             }

         });

     }

     public NineSwing() {

         setTitle("设置窗体大小");// 设置窗体标题

         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 默认关闭方式

         setSize(250, 250);// 设置窗体大小

         contentPane = new JPanel();// 创建内容面板

         contentPane.setLayout(new BorderLayout(0, 0));

         setContentPane(contentPane);// 设置内容面板

         JLabel label = new JLabel("宽度：250，高度：250");// 创建标签控件

         contentPane.add(label, BorderLayout.CENTER);// 添加标签控件到窗体

   }

 }