Java - Abstraction
You are designing a Java class hierarchy where some methods should have a default implementation but subclasses can override them if needed. Which class type best suits this design?
You are designing a Java class hierarchy where some methods should have a default implementation but subclasses can override them if needed. Which class type best suits this design?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand requirements
Some methods need default behavior, others can be overridden.Step 2: Analyze class types
Abstract classes can have both abstract methods (no body) and concrete methods (with body).Step 3: Evaluate options
Interfaces (before Java 8) only have abstract methods; concrete classes with final methods cannot be overridden.Final Answer:
Abstract class with both abstract and concrete methods -> Option AQuick Check:
Abstract classes allow default and overridable methods. [OK]
Quick Trick: Use abstract class for default and overridable methods [OK]
Common Mistakes:
- Using interfaces when default implementation is needed
- Making methods final to allow overriding
- Using abstract classes with only abstract methods
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