Java code to connect through Proxy!

For Normal Java Applications, I have successfully connected through Proxy using the method specified in this link

ProxyAuthentication helper class, Code:

package proxytester;

import java.net.Authenticator;
import java.net.PasswordAuthentication;

class ProxyAuthenticator extends Authenticator {

  private String user, password;

  public ProxyAuthenticator(String user, String password) {
    this.user = user;
    this.password = password;
  }

  protected PasswordAuthentication getPasswordAuthentication() {
    return new PasswordAuthentication(user, password.toCharArray());
  }

}

Code:

package proxytester;

import java.io.IOException;
import java.net.Authenticator;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;


public class Main {

  public static void main(String[] args) {
  Authenticator.setDefault(new ProxyAuthenticator("YOUR USER NAME", "YOUR PASSWORD"));
  System.setProperty("http.proxyHost", "172.16.184.5");
  System.setProperty("http.proxyPort", "80");

  try {
    URL yahoo = new URL("http://www.yahoo.com/");
    URLConnection yahooConnection = yahoo.openConnection();
    yahooConnection.connect();

    System.out.println("Content: "+yahooConnection.getContentType());
  } catch (MalformedURLException e) { // new URL() failed
     System.out.println("Exception"+e);

  }catch (IOException e) { // openConnection() failed
     System.out.println("Exception"+e);
  }

   System.out.println("ok");
 }
}