事件处理

完成一个按钮的事件处理程序，实现功能自拟，例如：改变窗口的背景颜色，改变按钮的位置等等

package ccc;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class niu extends JFrame {
    JFrame f;
    JPanel p;
    JButton b1;
    JButton b2;
    public niu(){
        f =new JFrame();
        p =new JPanel();
        b1 = new JButton("改变位置");
        b2 = new JButton("改变颜色");
        p.setLayout(null);                                                          //流布局
        b1.setBounds(150,150,100,30);
        b2.setBounds(150,100,100,30);
        f.setSize(350,350);
        f.add(p);
        p.add(b1);
        p.add(b2);
        b1.addActionListener(new b1Action());
        b2.addActionListener(new b2Action());
        f.setVisible(true);        
    }
    class b1Action implements ActionListener{
        
        public void actionPerformed(ActionEvent e) {
            p.setBackground(Color.BLUE);
    }
}
    
    class b2Action implements ActionListener{
        
        public void actionPerformed(ActionEvent e) {
            b2.setBounds(90,40,100,30);
    }
    }
    public static void main(String[] args){
        
        new niu();                                                                //调用函数
    }
    
}