Object-Oriented Programming · Question 14 · Hard
What is the output of the following Java code?
class A {
int x = 10;
int getX() { return x; }
}
class B extends A {
int x = 20;
int getX() { return x; }
}
// in main:
A o = new B();
System.out.println(o.x + " " + o.getX());- 10 10
- 10 20
- 20 20
- 20 10
Answer and explanation
Answer: B. 10 20
Explanation: Fields are not polymorphic: o.x is resolved from the reference type A and gives 10. getX() is overridden, so the call runs B's version and returns B's x, which is 20.
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