网络编程_InetAddress类的概述和使用

package cn.itcast_01;import java.net.InetAddress;import java.net.UnknownHostException;/* * 如果一个类没有构造方法: * A:成员变量全是静态的(Math,Arrays,Collections) * B:单例模式(Runtime) * C:类中有静态方法返回该类对象(InetAddress) * class Demo{ *  * public static Demo getXxx(){ * return new Demo(); * } * } * 看InetAddress类的成员方法:public static InetAddress getByName(String host):根据主机名或者IP地址的字符串表示得到IP地址对象。 */public class InetAddressDemo {public static void main(String[] args) throws UnknownHostException {// public static InetAddress getByName(String host)// InetAddress address = InetAddress.getByName("DESKTOP-MH05A1D");InetAddress address = InetAddress.getByName("192.168.31.165");// 获取两个东西:主机名,IP地址// public String getHostName():获取此 IP 地址的主机名。String name = address.getHostName();// public String getHostAddress()返回 IP 地址字符串（以文本表现形式）。String ip = address.getHostAddress();System.out.println(name + "---" + ip);}}