Question 207 of 481
Interface Features: Default, Static Methods, and Multiple Inheritance
Which THREE statements are true about interfaces in Java? (Choose three.)
Quick Answer
The answer is that options A, B, and D are correct because an interface can contain default methods, static methods, and can extend multiple interfaces using the extends keyword. Since Java 8, interfaces have evolved beyond abstract contracts to include concrete method implementations: default methods allow adding new functionality without breaking existing implementations, while static methods provide utility functions scoped to the interface. This directly addresses the concept of interface default static methods multiple inheritance, which the Oracle Java Foundations 1Z0-811 exam tests by asking you to distinguish between what is syntactically valid versus common misconceptions. A frequent trap is assuming interfaces can be instantiated or contain private fields—they cannot, as fields are implicitly public static final, though private methods are allowed since Java 9. Remember the mnemonic “DIMPS”: Default methods, Instance methods (static), Multiple inheritance (via extends), Public fields (static final), and Static methods—all valid in modern interfaces.
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 multiple interfaces
Options B, C, and D are true about interfaces in Java. An interface can extend multiple interfaces using the extends keyword. Since Java 8, interfaces can contain static methods (with body) and default methods. Option A is false because interfaces cannot be instantiated directly; they must be implemented by a class. Option E is false because interface fields are implicitly public static final; private fields are not permitted in interfaces (private methods are allowed since Java 9, but not fields).
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 be instantiated directly
Why it's wrong here
Interfaces are abstract types and cannot be instantiated.
- ✓
An interface can extend multiple interfaces
Why this is correct
Interfaces support multiple inheritance of type.
- ✓
An interface can contain static methods
Why this is correct
Static methods are allowed in interfaces since Java 8.
- ✓
An interface can contain default methods
Why this is correct
Default methods provide a default implementation in interfaces.
- ✗
An interface can have private fields
Why it's wrong here
Interface fields are implicitly public static final; private fields are not supported.
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Same concept, more angles
1 more way this is tested on 1Z0-811
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which TWO statements about interfaces in Java are true?
hard- A.An interface can have instance variables
- B.An interface can implement another interface
- ✓ C.An interface can extend another interface
- D.An interface can have final methods
- ✓ E.An interface can have default methods with a body
Why C: Interfaces can extend other interfaces and can have default methods with a body.
Last reviewed: Jun 23, 2026
This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.
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