S4_Java Basics Quiz

What is the purpose of using objects as parameters in methods?

• To enforce data encapsulation

• To reduce memory usage

• To allow methods to modify the original object

• To increase the method's execution speed

What does 'Call by Value' mean in Java?

• Passing the reference of the variable

• Passing a copy of the variable's value

• Passing the variable itself

• Passing the variable's address

Which keyword is used to declare a constant in Java?

• static

• immutable

• final

• const

What is method overloading?

• Defining multiple methods with the same name but different parameters

• Creating a method that calls itself

• Changing the return type of a method

• Using a method from a parent class

What is the main concept of inheritance in Java?

• Preventing method overriding

• Combining multiple classes into one

• Hiding data from other classes

• Creating new classes from existing classes

What is the purpose of the 'super' keyword in Java?

• To call a method from the current class

• To access a method from the parent class

• To create a new instance of a class

• To define a constant value

What is encapsulation in object-oriented programming?

• Creating multiple instances of a class

• Inheriting properties from a parent class

• Overriding methods in subclasses

• Hiding the internal state of an object

What does the 'this' keyword refer to in Java?

• A local variable

• The parent class

• The current object instance

• A static method

What is polymorphism in Java?

• The ability to hide data within a class

• The ability to inherit properties from multiple classes

• The ability to create multiple classes

• The ability to call the same method on different objects

What does the 'static' keyword indicate in Java?

• It is used to define an abstract class

• It is a method that cannot be overridden

• It can only be accessed within the same class

• It belongs to the class rather than instances of the class