For Android tcp, udp, urla, and simple chat room application, for beginners is a good source.

网络编程\.classpath
........\.project
........\.settings\org.eclipse.jdt.core.prefs
........\bin\netdemo\IPDemo.class
........\...\tcp_demo\Client$1.class
........\...\........\Client.class
........\...\........\Server$1.class
........\...\........\Server.class
........\...\udp_demo\UDPDemo.class
........\...\........\UDPReceiveDemo.class
........\...\....yiduiyi\Server1$1.class
........\...\...........\Server1.class
........\...\...........\Server2$1.class
........\...\...........\Server2.class
........\...\.rl_demo\Test.class
........\...\yiduiduo\Server$1.class
........\...\........\Server.class
........\src\netdemo\IPDemo.java
........\...\tcp_demo\Client.java
........\...\........\Server.java
........\...\udp_demo\UDPDemo.java
........\...\........\UDPReceiveDemo.java
........\...\....yiduiyi\Server1.java
........\...\...........\Server2.java
........\...\.rl_demo\Test.java
........\...\yiduiduo\Server.java
........\bin\netdemo
........\...\tcp_demo
........\...\udp_demo
........\...\udp_yiduiyi
........\...\url_demo
........\...\yiduiduo
........\src\netdemo
........\...\tcp_demo
........\...\udp_demo
........\...\udp_yiduiyi
........\...\url_demo
........\...\yiduiduo
........\.settings
........\bin
........\src
网络编程

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