Java OCA OCP Practice Question 2276

Question

What does the following print? 

1:   class SmartCar extends Car { 
2:      private String getType() { return "smart watch"; } 
3:      public String getName() { 
4:         return getType() + ","; 
5:      } //from   w  ww  .  j a  v  a  2s .c  o  m
6:   } 
7:   public class Car { 
8:      private String getType() { return "watch"; } 
9:      public String getName(String suffix) { 
10:        return getType() + suffix; 
11:     } 
12:     public static void main(String[] args) { 
13:        Car watch = new Car(); 
14:        Car smartCar = new SmartCar(); 
15:        System.out.print(watch.getName(",")); 
16:        System.out.print(smartCar.getName("")); 
17:     } 
18:  }
  • A. smart watch,smart watch
  • B. smart watch,watch
  • C. watch,smart watch
  • D. watch,watch
  • E. None of the above


D.

Note

Line 15 calls the method on line 9 since it is a Car object.

Line 16 is a SmartCar object.

However, the getName() method is not overridden in SmartCar since the method signature is different.

Therefore, the method on line 9 gets called again.

That method calls getType().

Since this is a private method, it is not overridden and watch is printed twice.

Option D is correct.




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