Java Data Type Tutorial - Java SecurityManager .checkListen (int port)

Syntax

SecurityManager.checkListen(int port) has the following syntax.

public void checkListen(int port)

Example

In the following code shows how to use SecurityManager.checkListen(int port) method.

//from w ww  .  j av a  2  s. c  o m
public class Main extends SecurityManager {

   // checkListen needs to be overriden
   @Override
   public void checkListen(int port) {
      throw new SecurityException();
   }

   public static void main(String[] args) {
      System.setProperty("java.security.policy", "file:/C:/java.policy");

      Main sm = new Main();

      System.setSecurityManager(sm);

      // perform the check
      sm.checkListen(8080);

      System.out.println("Allowed!");
   }
}