Java OCA OCP Practice Question 2331

Question

Given the following code. 

class Shape {} 
class Rectangle extends Shape implements Resizable{} 
class Shorts extends Shape {} 
interface Resizable {} 

class Main { /*  w  ww  .  j  a v  a 2  s  .c om*/
    public static void main(String sr[]) { 
        Rectangle s = new Rectangle(); 
        //INSERT CODE HERE 
        System.out.println(res); 
    } 
 }

Which options will print true?. 

a  boolean res = new Shape() instanceof Rectangle; 

b  boolean res = new Rectangle() instanceof Resizable; 

c  boolean res = null instanceof Main; 

d  Shape cloth = new Shape(); 
   Rectangle shirt = new Rectangle(); 
   boolean res = shirt instanceof cloth; 



b

Note

Option (a) prints false.

Option (c) prints false.

It doesn't fail to compile because null is a valid literal value that can be used for objects.

Option (d) fails to compile.

The instanceof operator must be followed by the name of an interface, class, or enum.




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