UNIT 2

Which concept allows two methods to have the same name but different parameters?

• a) Overriding

• b) Overloading

• c) Dynamic dispatch

• d) Encapsulation

In Java, objects are passed to methods:

• a) By reference

• b) By copy of the object

• c) By value

• d) By pointer

A static nested class can access:

• a) Only static members of outer class

• b) All members of outer class

• c) Only private members

• d) Nothing from outer class

Which keyword is used for inheritance?

• a) implements

• b) extend

• c) inherit

• d) None of the above

Default package access modifier (no keyword) means:

• a) private

• b) protected

• c) package-private

• d) public

If a method returns an object, what is returned?

• a) A new copy of the object

• b) The object’s reference

• c) Object memory address

• d) All of the above

When overriding a method:

• a) Return type must always be exactly the same

• b) Static methods can be overridden

• c) Return type can be covariant

• d) Return type can be anything

The super() call in a constructor must be:

• a) Last statement

• b) First statement

• c) Optional anywhere

• d) Not allowed

In runtime polymorphism, which decides which method is executed?

• a) Object type

• b) Reference type

• c) Compiler

• d) JVM garbage collector

Which is true?

• a) Abstract class cannot have constructors

• b) Abstract class can have both abstract and concrete methods

• c) Abstract class cannot have variables

• d) Abstract class must only contain abstract methods