java的练习

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闲的无聊蛋疼......自己敲了下java的代码.....纯属无聊

import java.awt.BorderLayout;import java.awt.GridLayout;import javax.swing.*;public class jisuanqi extends JFrame {public jisuanqi() {JPanel p1 = new JPanel(new GridLayout(4, 3));for (int i = 1; i <= 9; i++) {p1.add(new JButton(" " + i));}p1.add(new JButton(" " + 0));p1.add(new JButton("start"));p1.add(new JButton("stop"));JPanel p2 = new JPanel(new BorderLayout());p2.add(new JTextField("xxxxx"), BorderLayout.NORTH);p2.add(p1, BorderLayout.CENTER);add(p2, BorderLayout.EAST);JButton j = new JButton("xxxx");j.setLayout(null);j.setBounds(20,20,20,20);//这里一直不会调节按钮大小,醉了........我设置了布局null啊,为什么不能呢,啊啊啊啊啊!!!//add(j, BorderLayout.CENTER);add(j);}public static void main(String[] args) {jisuanqi jj = new jisuanqi();jj.setTitle("hello world!");jj.setSize(400, 500);jj.setLocationRelativeTo(null);jj.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);jj.setVisible(true);}}

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