Java prepared simple network chat program with a server-side and client, but to develop the first version, there is a lot of bug

chat
....\.classpath
....\.project
....\com
....\...\client
....\...\......\Client.class
....\...\......\Client.java
....\...\......\connect
....\...\......\.......\clientpad$1.class
....\...\......\.......\clientpad.class
....\...\......\.......\clientpad.java
....\...\......\.......\net.class
....\...\......\.......\net.java
....\...\......\.......\ThreadChat.class
....\...\......\.......\ThreadChat.java
....\...\server
....\...\......\server$1.class
....\...\......\server.class
....\...\......\server.java
....\...\......\ServerThread.class
....\...\......\ServerThread.java

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