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

 

1 package ccc; 2 import java.awt.Color; 3 import java.awt.event.ActionEvent; 4 import java.awt.event.ActionListener; 5 import javax.swing.*; 6 public class niu extends JFrame { 7     JFrame f; 8     JPanel p; 9     JButton b1;10     JButton b2;11     public niu(){12         f =new JFrame();13         p =new JPanel();14         b1 = new JButton("改变位置");15         b2 = new JButton("改变颜色");16         p.setLayout(null);                                                          //流布局17         b1.setBounds(150,150,100,30);18         b2.setBounds(150,100,100,30);19         f.setSize(350,350);20         f.add(p);21         p.add(b1);22         p.add(b2);23         b1.addActionListener(new b1Action());24         b2.addActionListener(new b2Action());25         f.setVisible(true);        26     }27     class b1Action implements ActionListener{28         29         public void actionPerformed(ActionEvent e) {30             p.setBackground(Color.BLUE);31     }32 }33     34     class b2Action implements ActionListener{35         36         public void actionPerformed(ActionEvent e) {37             b2.setBounds(90,40,100,30);38     }39     }40     public static void main(String[] args){41         42         new niu();                                                                //调用函数43     }44     45 }