Java Programming - MCQ Practice Questions

Which of the following statements about 'instanceof' operator is true?

In the context of constructors, which statement is correct?

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

Which of the following best describes polymorphism in Java?

An abstract class in Java cannot be instantiated, but it can have concrete methods. Which statement explains why?

Which of the following correctly implements method overloading rules in Java?

Which statement about interface implementation in Java is true?

Which statement about the 'protected' access modifier is correct?

Which of the following is NOT a characteristic of an interface in Java?

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

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?