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Object Class & Overriding Interview Questions

MCQ Question 1 of 10

Question 1: JAVA OOPS - Object Class Basics

Which of the following is true about the Object class in Java?

It is the parent of all classes in JavaOnly abstract classes extend ObjectObject class cannot be extendedObject class has no methods

Question 2: JAVA OOPS - Object Class Methods

Which of the following methods are defined in Object class?

toString(), hashCode(), equals(), getClass()finalize(), clone(), notify(), wait()Both A and BNone of the above

Question 3: JAVA OOPS - Overriding Basics

Which statement about method overriding is true?

Overridden method must have same name, parameters, and return typePrivate methods can be overriddenStatic methods can be overriddenConstructor can be overridden

Question 4: JAVA OOPS - Overriding Example

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();
    }
}

ABCompilation ErrorRuntime Error

Question 5: JAVA OOPS - toString() Overriding

What is the purpose of overriding toString() method?

To return the string representation of objectTo compare objectsTo generate hash codeTo finalize objects

Question 6: JAVA OOPS - equals() Overriding

Which statement is correct about equals() method?

Default equals() compares object referencesOverriding equals() allows content comparisonBoth A and Bequals() cannot be overridden

Question 7: JAVA OOPS - Final Method Overriding

Which statement is correct?

Final methods can be overriddenFinal methods cannot be overriddenFinal methods are always staticFinal methods can be abstract

Question 8: JAVA OOPS - Object Class hashCode()

Which statement is true about hashCode()?

Returns a unique value for each objectCan be overridden for custom objectsShould be overridden when equals() is overriddenBoth B and C

Question 9: JAVA OOPS - Object Class clone()

Which statement is correct about clone() method?

Returns a shallow copy of objectThrows CloneNotSupportedException if class doesn’t implement CloneableBoth A and Bclone() is final

Question 10: JAVA OOPS - Overriding Rules

Which of the following rules is true for overriding?

Access level can be more restrictiveReturn type must be compatible or covariantPrivate methods can be overriddenStatic methods can be overridden