Java 2

What is a class in Java?

• • A) A function template.

• • B) A blueprint for creating objects.

• • C) A specific type of data structure.

• • D) A type of variable.

Which keyword is used to inherit a class in Java?

• • A) extends

• • B) super

• • C) this

• • D) implements

What does the 'static' keyword indicate?

• • A) The variable or method belongs to the main class.

• • B) The variable or method belongs to an instance of a class.

• • C) The variable or method belongs to the class rather than any instance.

• • D) The access to the variable or method is restricted.

Which of the following is not an OOP principle?

• • A) Encapsulation

• • B) Inheritance

• • C) Polymorphism

• • D) Compilation

What is an object in Java?

• • A) A reference type variable that can store primitive data types only.

• • B) A runtime entity and instance of a class.

• • C) A type of data structure.

• • D) A blueprint for creating static methods.

What is an interface in Java?

• • A) A class that is used to implement security.

• • B) A template that can be applied to a class.

• • C) A collection of abstract methods and constants.

• • D) A type of data structure.

Which keyword is used to implement an interface to a class?

• • A) extends

• • B) super

• • C) implements

• • D) static

Which of these is true about interfaces in Java 8 and beyond?

• • A) Interfaces can contain only abstract methods.

• • B) Interfaces cannot contain default methods.

• • C) Interfaces can contain default and static methods.

• • D) Interfaces can contain final methods only.

How many interfaces can a Java class implement?

• • A) Only one

• • B) Only two

• • C) Only four

• • D) Any number

What will happen if two interfaces with the same default method are implemented by a class?

• • A) Compilation error

• • B) Runtime error

• • C) The method in the first interface is used.

• • D) The class must override the default method.