chat
....\version1
....\........\MyServer$1.class
....\........\MyServer.class
....\........\MyServer.java
....\version2
....\........\ChatThread.class
....\........\ChatThread.java
....\........\ChatTool.class
....\........\ChatTool.java
....\........\MyServer.class
....\........\MyServer.java
....\........\需求.txt