package com.swing.demo;import java.awt.EventQueue;import java.awt.Graphics;import java.awt.Image;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;import javax.swing.J

package com.swing.demo;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;/**** 使用GridBag布局【高端】* *