请问我想在窗口添加一个按钮怎么写

package com.mch0dm1n.seticom;

import javax.swing.JButton;

import javax.swing.JFrame;

public class chuangkou extends JFrame {

public chuangkou() {

this.setTitle("智伟创造");

this.setBounds(300, 200, 580, 600);

this.setSize(580, 600);

this.setLocation(300, 200);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

this.setLocationRelativeTo(null);// 为null,启动程序时窗口将置于屏幕的中央

JButton diamondsButton[][] = new JButton[6][5];//游戏按钮数组 

}

public static void main(String[] args) {

new chuangkou();

}

}