Java OCA OCP Practice Question 832

Question

Consider the following code: 

class MyClass { //from  w w  w .ja va  2  s.c  o  m
 public XXX m1 (int a){ 
   return a*10/4-30; 
  } 
 } 
class MyClass2 extends MyClass { 
 public YYY m1 (int a){ 
   return a*10/4.0; 
  } 
 }

What can be substituted for XXX and YYY so that it can compile without any problems?

Select 1 option

  • A. int, int
  • B. int, double
  • C. double, double
  • D. double, int
  • E. Nothing, they are simply not compatible. 


Correct Option is  : C

Note

The overriding method is allowed to return a subclass of the return type defined in the overridden method.

If a base class's method is: public MyClass m (); then a subclass is free to override it with: public MyClass1 m (); if MyClass 1 extends MyClass.




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