Java OCA OCP Practice Question 1076

Question

What is printed by the following? (Choose all that apply) 

1:  public class Main { 
2:    public String name; 
3:    public void run() { 
4:      System.out.print("1"); 
5:      try { //from   www  .  ja  v  a  2 s .  c  o  m
6:        System.out.print("2"); 
7:        name.toString(); 
8:        System.out.print("3"); 
9:      } catch (NullPointerException e) { 
10:       System.out.print("4"); 
11:       throw e; 
12:     } 
13:     System.out.print("5"); 
14:   } 
15:   public static void main(String[] args) { 
16:     Main m = new Main(); 
17:     m.run(); 
18:     System.out.print("6"); 
19:   } 
20:}
  • A. 1
  • B. 2
  • C. 3
  • D. 4
  • E. 5
  • F. 6
  • G. The stack trace for a NullPointerException 


A, B, D, G.

Note

The main() method invokes run on a new Main object.

Line 4 prints 1 and line 6 prints 2, so options A and B are correct.

Line 7 throws a NullPointerException, which causes line 8 to be skipped, so C is incorrect.

The exception is caught on line 9 and line 10 prints 4, so option D is correct.

Line 11 throws the exception again, which causes run() to immediately end, so line 13 doesn't execute and option E is incorrect.

The main() method doesn't catch the exception either, so line 18 doesn't execute and option F is incorrect.

The uncaught NullPointerException causes the stack trace to be printed, so option G is correct.




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