import java.awt.*;
import javax.swing.*;
class WindowFlow extends JFrame{
	WindowFlow(String s){
		super(s);
		Container contenetPane=this.getContentPane();
		BorderLayout flow=new BorderLayout();
		contenetPane.setLayout(flow);
		JButton bnorth=new JButton("北"),
			bsouth=new JButton("南"),
			beast=new JButton("東"),
			bwest=new JButton("西");
		JTextArea bCentre=new JTextArea("中心");
		contenetPane.add(bnorth,BorderLayout.NORTH);
		contenetPane.add(bsouth,BorderLayout.SOUTH);
		contenetPane.add(beast,BorderLayout.EAST);
		contenetPane.add(bwest,BorderLayout.WEST);
		contenetPane.add(bCentre,BorderLayout.CENTER);
		contenetPane.validate();
		setBounds(100,100,150,120);
		setVisible(true);
		setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		
}
}
public class 布局{
	public static void main(String args[]){
		WindowFlow win=new WindowFlow("FlowLayout布局窗口");
}
}