Java OOPs Concept Quiz 1

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1. What is encapsulation in Java?

• The process of defining a class
• The process of wrapping data and code together
• The process of creating objects
• The process of defining methods

2. What is polymorphism in Java?

• The ability of a variable, function, or object to take on multiple forms
• The process of wrapping data and code together
• The process of defining methods
• The process of creating objects

3. What is inheritance in Java?

• The process by which one class acquires the properties of another class
• The process of defining methods
• The process of creating objects
• The process of wrapping data and code together

4. Which of the following is an example of method overloading?

• Creating multiple methods with the same name but different parameters
• Creating a method with the same name in the subclass
• Creating multiple methods with different names
• None of the above

5. What is method overriding in Java?

• A subclass provides a specific implementation of a method already defined in its superclass
• Creating multiple methods with the same name but different parameters
• Creating a method with the same name in the same class
• None of the above

6. What is an abstract class in Java?

• A class that cannot be instantiated
• A class that can be instantiated
• A class that cannot have methods
• A class that can only have static methods

7. What is an interface in Java?

• A class that can implement multiple interfaces
• A reference type in Java that is similar to a class
• A class that can only have abstract methods
• None of the above

8. What is the purpose of the "super" keyword in Java?

• To refer to the immediate superclass object
• To create a new object
• To refer to the current class object
• To refer to a static method

9. Can a class implement multiple interfaces in Java?

• Yes
• No
• Only if the interfaces have different methods
• Only if the class is abstract

10. What is the purpose of the "this" keyword in Java?

• To refer to the current class object
• To create a new object
• To refer to the immediate superclass object
• To refer to a static method