Java OOP and Inheritance Flashcards
6 cards from real SCJP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Java OOP and Inheritance flashcards as text
Which statement about Java interfaces is correct for SCJP?
Answer: Interface fields are public static final by default
All fields declared in an interface are implicitly `public static final` (constants).
What is encapsulation in Java?
Answer: Hiding implementation by restricting direct access to fields and exposing via methods
Encapsulation bundles data and methods together while restricting direct field access, typically using private fields and public getters/setters.
What does the `instanceof` operator return when the reference is null?
Answer: false
`null instanceof AnyClass` always returns `false` without throwing an exception.
In Java, can a class implement more than one interface?
Answer: Yes, with a comma-separated list
A Java class can implement multiple interfaces by listing them with commas: `class Foo implements A, B, C`.
Which of the following correctly defines a constructor in Java?
Answer: It has the same name as the class and no return type
A constructor shares the class name and has no return type declared (not even void).
What is the effect of marking a class member as `private`?
Answer: Accessible only within the declaring class
`private` is the most restrictive access modifier, limiting access to only the class in which the member is declared.
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