swing之gridlayout

package gui1;

import java.awt.FlowLayout;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

public class gridlayout1 extends JFrame{
    JButton [] a={null,null,null,null,null,null,null,null};
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        gridlayout1 g1=new gridlayout1();
    }
public gridlayout1()
         {

    a[]=new JButton("瓜子");
    a[]=new JButton("话梅");
    a[]=new JButton("西瓜");
    a[]=new JButton("草莓");
    a[]=new JButton("香蕉");
    a[]=new JButton("苹果");
    a[]=new JButton("栗子");
    a[]=new JButton("黄瓜");
    //a[8]=new JButton("葡萄");

    this.setLayout(new GridLayout(,,,));//默认是边界布局，如果想变成其他布局，加上

    this.add(a[]);
    this.add(a[]);
    this.add(a[]);
    this.add(a[]);
    this.add(a[]);
    this.add(a[]);
    this.add(a[]);
    this.add(a[]);

    this.setTitle("网格布局gridlayout");
    this.setSize(,);
    this.setLocation(, );
    this.setResizable(true);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    this.setVisible(true);

         }
}