[Solved] What is the main purpose of default methods in Java interfaces? — Ans: To allow interfaces to have method bodies without breaking existing... | Java

Java - Interfaces

What is the main purpose of default methods in Java interfaces?

ATo enable multiple inheritance of classes

BTo declare abstract methods that must be implemented by classes

CTo create private helper methods inside interfaces

DTo allow interfaces to have method bodies without breaking existing implementations

Step-by-Step Solution

Solution:

Step 1: Understand interface method rules before Java 8
Interfaces could only declare abstract methods without bodies, forcing all implementing classes to define them.
Step 2: Role of default methods
Default methods allow interfaces to provide method bodies, so new methods can be added without breaking existing classes.
Final Answer:
To allow interfaces to have method bodies without breaking existing implementations -> Option D
Quick Check:
Default methods add bodies to interfaces safely [OK]

Quick Trick: Default methods add code to interfaces without breaking old classes [OK]

Common Mistakes:

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What is the main purpose of default methods in Java interfaces?