Which of the following method declarations correctly overrides a parent method public int calculate(int x)?

easy📝 Syntax Q12 of 15

Java - Polymorphism

Which of the following method declarations correctly overrides a parent method public int calculate(int x)?

Apublic int calculate(int x) { return x * 2; }

Bpublic void calculate(int x) { System.out.println(x); }

Cpublic int calculate(double x) { return (int)x; }

Dstatic public int calculate(int x) { return x + 1; }

Step-by-Step Solution

Solution:

Step 1: Match method signature exactly
The overriding method must have the same name and parameter types: calculate(int x).
Step 2: Check return type and modifiers
Return type must be int and method must not be static.
Final Answer:
public int calculate(int x) { return x * 2; } -> Option A
Quick Check:
Exact signature and return type = A [OK]

Quick Trick: Match method name, parameters, and return type exactly [OK]

Common Mistakes:

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