java中Swing中URl怎么使用

Question

package com.ten;import java.awt.Container;import java.net.URL;import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.*;public class MyImageIcon extends JFrame{ public MyImageIcon(){ Container con = getContentPane(); JLabel jl = new JLabel("这是一个JFrame窗体",JLabel.CENTER); URL url = MyImageIcon.class.getResource("imageButton.jap"); Icon icon = new ImageIcon(url); jl.setIcon(icon); jl.setHorizontalAlignment(SwingConstants.CENTER); jl.setOpaque(true); con.add(jl); setSize(250,100); setVisible(true); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static void main(String[] args){ new MyImageIcon(); } }