Polymorphism Interview Questions Mock Test

Question 1: JAVA OOPS - Compile-time Polymorphism

Which of the following demonstrates compile-time polymorphism in Java?

class Demo {
    void show() { System.out.println("No-arg"); }
    void show(int x) { System.out.println(x); }
}

Question 2: JAVA OOPS - Method Overloading Example

What will be printed?

class Demo {
    int add(int a, int b) { return a + b; }
    double add(double a, double b) { return a + b; }
}
public class Main {
    public static void main(String[] args) {
        Demo d = new Demo();
        System.out.println(d.add(5, 5));
        System.out.println(d.add(5.0, 5.0));
    }
}

Question 3: JAVA OOPS - Runtime Polymorphism

What will be printed?

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

Question 4: JAVA OOPS - Polymorphism with Parameters

Which of the following is true about polymorphism in Java?

Question 5: JAVA OOPS - `super` in Runtime Polymorphism

What will be printed?

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

Question 6: JAVA OOPS - Polymorphism with Return Type

Which is true about overriding and return types?

Question 7: JAVA OOPS - Static Method and Polymorphism

Which statement is correct?

Question 8: JAVA OOPS - Constructor and Polymorphism

Which statement is true?

Question 9: JAVA OOPS - Polymorphism with Abstract Class

Which is true?

Question 10: JAVA OOPS - Interface and Polymorphism

Which is correct regarding interface polymorphism?