Abstraction Interview Questions Mock Test

Question 1: JAVA OOPS - Abstract Class Basics

Which of the following statements about abstract classes is true?

Question 2: JAVA OOPS - Abstract Method Implementation

What will happen when we run the following code?

abstract class A {
    abstract void show();
}
class B extends A {
    void show() { System.out.println("Hello"); }
}
public class Main {
    public static void main(String[] args) {
        A obj = new B();
        obj.show();
    }
}

Question 3: JAVA OOPS - Abstract Class Constructor

Which statement is true about constructors in abstract classes?

Question 4: JAVA OOPS - Multiple Abstract Classes

Which statement is correct?

Question 5: JAVA OOPS - Interface vs Abstract Class

Which is true about interface and abstract class?

Question 6: JAVA OOPS - Abstract Class Reference

What will be printed?

abstract class A {
    abstract void show();
    void display() { System.out.println("Display"); }
}
class B extends A {
    void show() { System.out.println("Show"); }
}
public class Main {
    public static void main(String[] args) {
        A obj = new B();
        obj.display();
    }
}

Question 7: JAVA OOPS - Abstract Method Requirement

Which of the following is true?

Question 8: JAVA OOPS - Interface Implementation

What will happen with the following code?

interface A {
    void show();
}
class B implements A {
    public void show() { System.out.println("Hello"); }
}
public class Main {
    public static void main(String[] args) {
        A obj = new B();
        obj.show();
    }
}

Question 9: JAVA OOPS - Abstract Class with Main Method

Which is correct?

Question 10: JAVA OOPS - Purpose of Abstraction

What is the main purpose of abstraction in Java?