**作用：**包含IP和端口信息，常用于Socket通信。此类实现 IP 套接字地址(IP 地址 + 端口号)，不依赖任何协议。

import java.net.InetSocketAddress;
public class Test4 {
    public static void main(String[] args) {
        InetSocketAddress socketAddress = new InetSocketAddress("127.0.0.1", 8080);
        InetSocketAddress socketAddress2 = new InetSocketAddress("localhost", 9000);
        System.out.println(socketAddress.getHostName());
        System.out.println(socketAddress2.getAddress());
    }
}