Compile Java File: AuthenticatorgetPasswordAuthenticationExample1

import java.util.concurrent.BlockingQueue;      
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.URL;
      
      public class AuthenticatorgetPasswordAuthenticationExample1{
	       public static void main(String[] args) {
	        try {
                    passwordvalidator obj = new passwordvalidator();
	            Authenticator.setDefault(new passwordvalidator());
             URL url = new URL("https://www.javatpoint.com");

// calling password validator
                     obj.getPasswordAuthentication();
	            BufferedReader inb = new BufferedReader(new InputStreamReader(url.openStream()));
                    String line;
	            while ((line = inb.readLine()) != null) {
	               System.out.println(line);
	            }

inb.close();
	        }

catch (MalformedURLException e) {
	            System.out.println("Malformed URL: " + e.getMessage());
	        }
	        catch (IOException e) {
	            System.out.println("I/O Error: " + e.getMessage());
	        }
	    }
               
     public static class PasswordValidator extends Authenticator {

@Override
                    protected PasswordAuthentication getPasswordAuthentication() {
                     System.out.println(" password validating...");
	            String username = "javaTpoint";
	            String password = "12345";
	            return new PasswordAuthentication(username, password.toCharArray());
        }
	             }    }

Output

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