UDPPingJava ping with UDP protocol 🛠 Server socat -v UDP-LISTEN:4000,fork PIPE Now a echo server is listening at port 4000. 编译 javac UDPPing.java 执行 java UDPPing 127.0.0.1 4000 java UDPPing 127.0.0.1 4000 100 100 64