File list (Check if you may need any files):
在JPanel面板上画图
..................\.classpath
..................\.project
..................\.settings
..................\.........\org.eclipse.jdt.core.prefs
..................\bin
..................\...\res
..................\...\...\背景.jpg
..................\...\yuanqiao
..................\...\........\Main.class
..................\...\........\PanelBack.class
..................\src
..................\...\res
..................\...\...\背景.jpg
..................\...\yuanqiao
..................\...\........\Main.java
..................\...\........\PanelBack.java