1Z0-811 Object-Oriented Programming Practice Question
class Parent { void show() { System.out.print("Parent"); } }
class Child extends Parent { void show() { System.out.print("Child"); } }
public class Test { public static void main(String[] args) { Parent p = new Child(); p.show(); } }What is the output?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Child
Although the reference is Parent, the object is Child, and show() is overridden, so Child's version is called.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Compilation error
Why it's wrong here
Incorrect; the code compiles fine.
- ✗
No output
Why it's wrong here
Incorrect; output is printed.
- ✗
Parent
Why it's wrong here
Incorrect; method invocation follows dynamic binding.
- ✓
Child
Why this is correct
Correct. Although the reference is Parent, the object is Child, and show() is overridden, so Child's version is called.
- ✗
Runtime error
Why it's wrong here
Incorrect; no runtime error.
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