1Z0-811 Object-Oriented Programming Practice Question
Which TWO statements about interfaces in Java are true?
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
✓
An interface can extend another interface
Interfaces can extend other interfaces and can have default methods with a body.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
An interface can have instance variables
Why it's wrong here
Interface variables are implicit public static final constants, not instance variables.
- ✗
An interface can implement another interface
Why it's wrong here
Interfaces cannot implement other interfaces; they extend them.
- ✓
An interface can extend another interface
Why this is correct
Interfaces can extend other interfaces.
- ✗
An interface can have final methods
Why it's wrong here
Interface methods cannot be final; they are meant to be overridden.
- ✓
An interface can have default methods with a body
Why this is correct
Since Java 8, interfaces can have default methods with a body.
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