1Z0-811 Object-Oriented Programming Practice Question
Consider the following interface: public interface Drawable { void draw(); } A developer implements Drawable in class Circle. Which statement about the implementation is correct?
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
✓
The draw method must be declared public
Interface methods are implicitly public and abstract unless declared as default or static. In this interface, draw() is abstract, so it cannot have a body. Therefore, the implementing class must declare draw() as public (making A correct). Option D is false because the interface method has no body. Option C is false because Circle provides an implementation, so the condition for being abstract is not met. Thus, only A is correct, making B incorrect.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The draw method must be declared public
Why this is correct
Correct: Interface methods are implicitly public, so the implementing class must declare the method as public.
- ✗
Both A and D
Why it's wrong here
Incorrect: Only A is correct; D is false because the interface method is abstract and cannot have a body.
- ✗
The class must be abstract if it does not provide body for draw
Why it's wrong here
Incorrect: This statement is true in general, but Circle provides a body for draw(), so it does not need to be abstract.
- ✗
The draw method can have a body in the interface
Why it's wrong here
Incorrect: The interface method is declared as void draw(); without default, so it is abstract and cannot have a body.
- ✗
The draw method must be declared final
Why it's wrong here
Incorrect: Interface methods cannot be declared final; they are meant to be overridden.
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