为什么我跟老师输入的代码一样，可是我的有异常
java.net.BindException: Address already in use: JVM_Bind at java.net.DualStackPlainSocketImpl.bind0(Native Method) at java.net.DualStackPlainSocketImpl.socketBind(Unknown Source) at java.net.AbstractPlainSocketImpl.bind(Unknown Source) at java.net.PlainSocketImpl.bind(Unknown Source) at java.net.ServerSocket.bind(Unknown Source) at java.net.ServerSocket.<init>(Unknown Source) at java.net.ServerSocket.<init>(Unknown Source) at 地址IP.Server.main(Server.java:20)
