Checking Internet Connectivity using Java

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.

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// 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);
        }
    }
}

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OUTPUT:
validating connectivity

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

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// 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");
        }
    }
}

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OUTPUT:
validating connectivity



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