File list (Check if you may need any files):
JH.java
新建文件夹
..........\Demo7\.classpath
..........\.....\.project
..........\.....\src\Demo7.java
..........\.....\bin\Demo7.class
..........\.....\src
..........\.....\bin
..........\Demo7
..........\demo3\.classpath
..........\.....\.project
..........\.....\src\Demo.java
..........\.....\bin\Demo.class
..........\.....\src
..........\.....\bin
..........\demo3
..........\Demo\.classpath
..........\....\.project
..........\....\src\Demo.java
..........\....\bin\Demo.class
..........\....\src
..........\....\bin
..........\Demo
..........\demo1\.classpath
..........\.....\.project
..........\.....\src\WangSong.java
..........\.....\bin\WangSong.class
..........\.....\src
..........\.....\bin
..........\demo1
..........\....2\.classpath
..........\.....\.project
..........\.....\src\Demo.java
..........\.....\bin\Demo.class
..........\.....\src
..........\.....\bin
..........\demo2