Java - Beginner - InetAdress Class

InetAdress class

          no constructor

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If a class does not have a constructor, there are three possible situations:

A: The members are all static (Math, Arrays, Collections)

B: Singleton Design Pattern

C: There is a static method in a class that returns an object of that class (InetAdress)

class Demo{
        private Demo();
        public static Demo getXxx(){
              return new Demo();}
       }

Member methods of InetAddress:

       public static InetAddress getByName(String host): Obtained according to the string representation of the host name or IP address

IP address.

package cn.itcast_01;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class InetAddressDemo {
            public static void main(String[] args) throws UnknownHostException {   	 
            	                 //according to hostname
				 //InetAddress address = InetAddress.getByName("DESKTOP-0257CLH");
				 
				//According to IP address
				 InetAddress address = InetAddress.getByName("10.141.25.35");
				 
				 //Get two things hostname, Ip address
				 
				 String name = address.getHostName();
				 String ip = address.getHostAddress();
				 
				 System.out.println(name+"------"+ip);
				   //DESKTOP-0257CLH------10.141.25.35
			}
}