import javax.swing.*;
import java.awt.*; 
class WindowBorder
{
    public static void main(String args[])
    {
       JFrame win=new JFrame("窗體"); 
       win.setBounds(100,100,300,300);
       win.setVisible(true);
       JButton bSouth=new JButton("南"),
              bNorth=new JButton("北"),
              bEast =new JButton("東"),
              bWest =new JButton("西");
       JTextArea  bCenter=new JTextArea("中心");
       Container contenetPane=win.getContentPane();
       contenetPane.add(bNorth,BorderLayout.NORTH);
       contenetPane.add(bSouth,BorderLayout.SOUTH);
       contenetPane.add(bEast,BorderLayout.EAST);
       contenetPane.add(bWest,BorderLayout.WEST); 
       contenetPane.add(bCenter,BorderLayout.CENTER);
       contenetPane.validate();
       win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}