Match each OOP concept to its Java implementation.
Drag a concept onto its matching description — or click a concept then click the description.
Using private fields with public getters/setters
Using extends keyword to derive a class
Method overriding and overloading
Using abstract classes and interfaces
Using fields that reference other objects
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Encapsulation: Use of private fields with public getter and setter methods
Correct matches: Encapsulation with private fields/getters; Inheritance with extends; Polymorphism with method overriding. Common confusions include mixing abstraction and polymorphism.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Encapsulation: Use of private fields with public getter and setter methods
Why this is correct
Encapsulation hides internal state and requires access through methods.
Inheritance: extends keyword
Why this is correct
Inheritance in Java is implemented using the extends keyword.
Polymorphism: abstract class and interface
Why it's wrong here
Incorrect — abstract classes and interfaces are used for abstraction, not polymorphism.
Abstraction: Method overriding
Why it's wrong here
Incorrect — method overriding is a form of polymorphism, not abstraction.
Polymorphism: Method overriding with dynamic dispatch
Why this is correct
Polymorphism allows a subclass to provide a specific implementation of a method.
Inheritance: Use of private fields
Why it's wrong here
Incorrect — private fields are used for encapsulation, not inheritance.
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