gridlayoutdemo.java

这一些程序都是实验之用

import java.awt.*;
import java.awt.event.*;
public class GridLayoutDemo extends Frame{
		private final String names[]={"one","two","three","four","five","six","seven","eight","nine"};
		private Button[] buttons=new Button[9];
		public Button button=new Button("zero");
		private boolean flag=true;
		final GridLayout layout1=new GridLayout(3,3,5,5);
		final GridLayout layout2=new GridLayout(3,3);
		
		
		
		public GridLayoutDemo(String title){
			super(title);
			setLayout();
			ActionListener listener=new ActionListener(){
					public void actionPerformed(ActionEvent event){
							setLayout();
							GridLayoutDemo.this.validate();
					}
			};
			for(int i=0;i<buttons.length;i++){
					buttons[i]=new Button(names[i]);
					buttons[i].addActionListener(listener);
					add(buttons[i]);
											 }
			setSize(250,250);
			setVisible(true);
			}
			private void setLayout(){
					if(flag)
							{		
							setLayout(layout1);
							}
					else
							setLayout(layout2);
					flag=!flag;
									}
			public static void main(String args[]){
			
				new GridLayoutDemo("Hello");						
					
			}
				
}