Java Programming - MCQ Practice Questions

Which statement about 'this' keyword is correct?

Consider: interface I1 { void method(); } interface I2 { void method(); } class C implements I1, I2 { public void method() { System.out.println("Method"); } } What will be the behavior?

What is method overloading?

Which of the following is true about abstract classes?

Consider the code: abstract class Animal { abstract void sound(); void sleep() { System.out.println("Zzz"); } } class Dog extends Animal { void sound() { System.out.println("Bark"); } } What can Dog objects do?

Which statement is true about the default access modifier (package-private) in Java?

What is the output of the following code? class Parent { void show() { System.out.println("Parent"); } } class Child extends Parent { void show() { System.out.println("Child"); } } public class Test { public static void main(String[] args) { Parent p = new Child(); p.show(); } }

Which of the following statements about the 'final' keyword is correct?

What is the difference between 'this' and 'super' keywords?

Consider a scenario where class B extends class A. If class A has a constructor with parameters, what must class B do?

What is the relationship between an abstract class and an interface in Java 8+?

Which of the following is true about interface default methods?

Which of the following correctly demonstrates composition over inheritance?

Which of the following demonstrates proper method overloading in Java?

What will happen if you try to override a final method in a subclass?

In Java, which of the following is true about abstract classes?

What is the correct way to call a parent class constructor from a child class?

Which statement about Java interfaces is INCORRECT according to 2024 specifications?

Consider a class hierarchy: Animal -> Dog -> Puppy. A Puppy reference can access which of the following?

What is the output of this code? class Test { static int x = 10; public static void main(String[] args) { System.out.println(x++); } }