JAVA 窗口跳转

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class jb{
public static void main(String args[]){
JFrame f=new JFrame("按钮事件");
Container contentPane=f.getContentPane();
contentPane.setLayout(new GridLayout(1,2));
Icon icon=new ImageIcon(".\\66.jpg");
JLabel label2=new JLabel("a",icon,JLabel.CENTER);
label2.setHorizontalTextPosition(JLabel.CENTER);
contentPane.setLayout(new FlowLayout( FlowLayout.CENTER,10,10));
JButton bb=new JButton("图片");
bb.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
JFrame bf=new JFrame("新窗体");
Icon icon=new ImageIcon(".\\56.jpg");
JLabel label2=new JLabel(icon);
bf.getContentPane().add(label2);
bf.setSize(300,360);
bf.show();
}});
contentPane.add(label2);
contentPane.add(bb);
f.pack();
f.show();