SCJP : java.io.Console Mock Exam Practice Questions

Questions no -1 
What is the output for the below code ?

import java.io.Console;

public class Test {
	public static void main(String... args) {
        
		
		Console con = System.console();
		  boolean auth = false;
		 
		  if (con != null)
		  {
		    int count = 0;
		    do
		    {
		      String uname = con.readLine(null);
		      char[] pwd = con.readPassword("Enter %s's password: ", uname);
		      
		      con.writer().write("\n\n");  
		    } while (!auth && ++count < 3);
		  }



	     	      
	}
}




options
A)NullPointerException
B)It works properly
C)Compile Error : No readPassword() method in Console class.
D)null

Correct answer is : A

Explanations : passing a null argument to any method in Console class will cause a NullPointerException to be thrown.