All Questions

Final Keyword Interview Questions

MCQ Question 1 of 10

Question 1: JAVA OOPS - Final Variable Basics

Which of the following is true about a final variable in Java?

Its value can be changed after initializationIt must be initialized only onceIt cannot be declaredIt is always static

Question 2: JAVA OOPS - Final Variable Example

What will happen?

class Demo {
    final int x = 10;
    void change() {
        // x = 20;  // Uncommenting this line
    }
}

Compilation Error if assignment is uncommentedWorks fineRuntime Errorx becomes static

Question 3: JAVA OOPS - Final Method

Which of the following statements about final methods is correct?

A final method can be overriddenA final method cannot be overriddenA final method can be abstractA final method can be static only

Question 4: JAVA OOPS - Final Method Example

What will happen when compiling the following code?

class A {
    final void show() { System.out.println("A"); }
}
class B extends A {
    // void show() { System.out.println("B"); }
}

Compilation Error if overriddenWorks fine as isRuntime Errorshow() becomes static automatically

Question 5: JAVA OOPS - Final Class

Which statement is true about a final class?

It can be extended by another classIt cannot be extendedIt can be abstractIt can have final methods only

Question 6: JAVA OOPS - Final Class Example

Which of the following will cause an error?

final class A {}
class B extends A {}

Compilation ErrorWorks fineRuntime ErrorAbstract class required

Question 7: JAVA OOPS - Final with Parameters

What is true about final parameters in Java?

Their values cannot be changed inside the methodThey must be staticThey can be reassignedThey make the method final

Question 8: JAVA OOPS - Blank Final Variable

Which statement is correct?

A final variable must be initialized when declaredA blank final variable can be initialized in constructorA blank final variable can never be initializedFinal variables cannot be instance variables

Question 9: JAVA OOPS - Final and Inheritance

Which of the following is true?

A subclass can override a final methodA subclass can extend a final classfinal keyword prevents modification where appliedfinal is only for variables

Question 10: JAVA OOPS - Purpose of Final

What is the main purpose of final keyword in Java?

To enhance runtime polymorphismTo prevent modification of variables, methods, or classesTo make variables publicTo enable multiple inheritance