java實現簡單登錄界面，就是按個按鈕就能從壹個JFRAME跳轉到另壹個，基本就是按登錄就能跳轉

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class jb{

public static void main(String args[]){

JFrame f=new JFrame("點我跳轉");

Container contentPane=f.getContentPane();

contentPane.setLayout(new GridLayout(1,2));

Icon icon=new ImageIcon("b.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("圖片");

bb.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

JFrame bf=new JFrame("新窗體");

Icon icon=new ImageIcon("enter.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();

}}