import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
class Sy81 extends JFrame implements ActionListener{
    JLabel label1,label2;
    JButton button1,button2;
    public Sy81(){
        setTitle("奥运");
        setLocation(200, 200);
        JLabel label1=new JLabel(new ImageIcon("aa.jpg"),JLabel.CENTER);
        JLabel label2=new JLabel("同一个世界，同一个梦想！",JLabel.CENTER);
        button1=new JButton("变色");
        button2=new JButton("退出");
        Container con3=getContentPane();
        FlowLayout flow1=new FlowLayout();
        setLayout(flow1);
        con3.add(label1);
        con3.add(label2);
        con3.add(button1);con3.add(button2);
        setSize(220,240);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        button1.addActionListener(this);
        button2.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e) {//这段是实现标签中的文本变颜色的功能！！但实际上它没有变色！！
        float a,b,c;
        if(e.getSource()==button1)
        {
        a=(float)(Math.random());
        b=(float)(Math.random());
        c=(float)(Math.random());
        label2.setForeground(new Color(a,b,c));
        }

        if(e.getSource()==button2)
         System.exit(0);
        
    }
    public static void main(String[] args){
        new Sy81();
    }
   
}