기서 일단 사진이라는 버튼을누르면 사진이 뜰수있게하고싶은데 왜 안뜨는건지 모르겠음

 import javax.imageio.ImageIO;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.io.File;

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;


public class ContentPaneEx extends JFrame {

Container contentPane;

JButton b1, b2, b3, b4;

ContentPaneEx() {

setTitle("실험");

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

c>

contentPane.setLayout(new FlowLayout(FlowLayout.CENTER, 30, 60));

b1 = new JButton("사진");

b1.addActionListener(new MyButtonListener());

contentPane.add(b1);

b2 = new JButton("동영상");

b2.addActionListener(new MyButtonListener());

contentPane.add(b2);

b3 = new JButton("음악");

b3.addActionListener(new MyButtonListener());

contentPane.add(b3);

b4 = new JButton("크레딧");

b4.addActionListener(new MyButtonListener());

contentPane.add(b4);

setSize(300, 300);

setVisible(true);

}

class MyButtonListener implements ActionListener {

public void actionPerformed(ActionEvent e) {

Object source = e.getSource();

if(source == b1) {

     Image image = null;

        try {

            URL url = new URL("http://www.mkyong.com/image/mypic.jpg");

            image = ImageIO.read(url); //로컬파일에서 불러오려면 File sourceimage = new File("c:\\mypic.jpg");

Image image = ImageIO.read(sourceimage);


        } catch (IOException e) {

        e.printStackTrace();

        }

 

        JFrame frame = new JFrame();

        frame.setSize(300, 300);

        JLabel label = new JLabel(new ImageIcon(image));

        frame.add(label);

        frame.setVisible(true);

    }

}

else if(source == b2) {

}

else if(source == b3) {

}

else if(source == b4) {

}

}

}

public static void main(String[] args) {

new ContentPaneEx();

}

}