Android（java）学习笔记79：java中InetAddress类概述和使用

 1 package cn.itcast_01;
 2 
 3 import java.net.InetAddress;
 4 import java.net.UnknownHostException;
 5 
 6 /*
 7  * 如果一个类没有构造方法：
 8  * A:成员全部是静态的(Math,Arrays,Collections)
 9  * B:单例设计模式(Runtime)
10  * C:类中有静态方法返回该类的对象(InetAddress)
11  *         class Demo {
12  *             private Demo(){}
13  * 
14  *             public static Demo getXxx() {
15  *                 return new Demo();
16  *             }
17  *         }
18  * 
19  * 看InetAddress的成员方法：
20  * 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
21  */
22 public class InetAddressDemo {
23     public static void main(String[] args) throws UnknownHostException {
24         // public static InetAddress getByName(String host)
25         // InetAddress address = InetAddress.getByName("liuyi");
26         // InetAddress address = InetAddress.getByName("192.168.12.92");
27         InetAddress address = InetAddress.getByName("192.168.12.63");
28 
29         // 获取两个东西：主机名，IP地址
30         // public String getHostName()
31         String name = address.getHostName();
32         // public String getHostAddress()
33         String ip = address.getHostAddress();
34         System.out.println(name + "---" + ip);
35     }
36 }