What will be the output of the following Java code?
public class Boxer1 
{
    Integer i;
    int x;
   public Boxer1(int y) 
   {
        x = i+y;
        System.out.println(x);
   }
   public static void main(String[] args) 
   {
       new Boxer1 (new Integer(4));
   }
}
a)  The value “4” is printed at the command line
b)  Compilation fails because of an error in line
c)  A NullPointerException occurs at runtime
d)	An IllegalStateException occurs at runtime
Answer: d
Explanation: Because we are performing operation on reference variable which is null.
						
						
												
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