Checking Internet Connectivity using Java

Last Updated : 30 May, 2018

Checking Internet connectivity using Java can be done using 2 methods:
1) by using getRuntime() method of java Runtime class.
2) by using methods of java URL and URLConnection classes.

#Java Runtime Class:This class is used to interact with java runtime environment (Java virtual machine) in which the application is running. It provides methods/functions to execute a process or a command, invoke garbage collector, get total and free memory in the JVM etc.

#getRuntime():This method of java runtime class returns the runtime object associated with the current java application.
you can learn more about this class here

#Java URL Class:This class provides methods that returns various information like protocol, hostname, file Name, port Number etc of the URL.

#Java URLConnection class:It represents a link between URL and application and can be used to read and write data to the specified resource referred by the URL.

#openConnection():This method of java URLConnection class opens the connection to the specified URL.
you can learn more about these classes here and here

NOTE: Provided method should be run on a local machine and not on an online compiler.
METHOD 1:
Output by this method will be 0 if the internet is connected and it will be 1 if the internet is not connected.

// Java program for Checking Internet connectivity 
import java.util.*; 
import java.io.*; 
  
class checking_internet_connectivity { 
    public static void main(String args[]) throws Exception 
    { 
        Process process = java.lang.Runtime.getRuntime().exec("ping www.geeksforgeeks.org"); 
        int x = process.waitFor(); 
        if (x == 0) { 
            System.out.println("Connection Successful, "
                               + "Output was " + x); 
        } 
        else { 
            System.out.println("Internet Not Connected, "
                               + "Output was " + x); 
        } 
    } 
} 

OUTPUT:
validating connectivity

METHOD 2:
If Internet is not connected it will throw an exception and catch will execute printing respective message.

// Java program for checking Internet connectivity 
import java.util.*; 
import java.io.*; 
import java.net.URL; 
import java.net.URLConnection; 
  
class checking_internet_connectivity { 
    public static void main(String args[]) 
    { 
        try { 
            URL url = new URL("https://www.geeksforgeeks.org/"); 
            URLConnection connection = url.openConnection(); 
            connection.connect(); 
  
            System.out.println("Connection Successful"); 
        } 
        catch (Exception e) { 
            System.out.println("Internet Not Connected"); 
        } 
    } 
} 