#1
What is the default access modifier for members of a class if no access modifier is specified?
package-private
ExplanationDefault access is limited to the same package.
#2
What is a static method in Java?
A method that belongs to the class rather than any specific instance.
ExplanationClass-owned method, not instance-specific.
#3
Which of the following is not a valid access modifier in Java?
internal
ExplanationInvalid access modifier in Java.
#4
What is method overloading in Java?
The process of defining multiple methods with the same name but different parameters.
ExplanationMultiple methods with different parameters but same name.
#5
Which keyword is used to prevent a method from being overridden in Java?
final
ExplanationPrevents method overriding.
#6
What is a constructor in Java?
A method used to create a new instance of a class.
ExplanationMethod for class instance creation.
#7
Which of the following best describes encapsulation in Java?
It is a process of hiding the implementation details of a class and only showing the necessary features of the class.
ExplanationHides class implementation details, reveals necessary features.
#8
What is the purpose of 'super' keyword in Java?
To call the constructor of the superclass.
ExplanationCalls superclass constructor.
#9
What is the purpose of the 'this' keyword in Java?
To refer to the current instance of the class.
ExplanationRefers to the current instance.
#10
What is polymorphism in Java?
The ability of a method to behave differently based on the object it is called on.
ExplanationMethod behaves according to object.
#11
What is the purpose of the 'final' keyword in Java?
To define a variable that cannot be reassigned.
ExplanationVariable is immutable once defined.
#12
What does the 'instanceof' operator do in Java?
It checks if an object is an instance of a particular class.
ExplanationVerifies object's class membership.
#13
Which of the following statements is true about method overriding in Java?
The final methods cannot be overridden.
ExplanationFinal methods are not subject to overriding.
#14
What is the difference between abstraction and encapsulation?
Abstraction is the process of hiding the implementation details of a class, while encapsulation is the ability to define a blueprint for a class.
ExplanationAbstraction hides, encapsulation defines blueprint.
#15
Which of the following is true about interfaces in Java?
A class can implement multiple interfaces.
ExplanationClass can implement multiple interfaces.
#16
Which of the following statements about interfaces in Java is true?
A class can implement multiple interfaces with conflicting method signatures.
ExplanationClass can implement multiple interfaces with conflicting methods.