Java OCA OCP Practice Question 2921

2. class Shape { }  
3. interface Printable { }  
4. class MyClass implements Printable { }  
5. public class Main extends MyClass {  
6.   public static void main(String[] args) {  
7.     Printable af = new MyClass();  
8.     MyClass ff = new MyClass();  
9.     Main b = new Main();  
10.     Shape r = new Shape();  
11.     if(af instanceof Printable) System.out.print("1 ");  
12.     if(af instanceof Main) System.out.print("2 ");  
13.     if(b instanceof Printable) System.out.print("3 ");   
14.     if(ff instanceof Main) System.out.print("4 ");  
15.     if(r instanceof Printable) System.out.print("5 ");  
16.   }  /*from  www  . j a va  2 s  . c  o m*/
17. }