Object-Oriented Programming in Java

Auto audio on: the next questions will be read aloud when you click Continue.

1. 1

   What does the 'extends' keyword signify in Java?

   A The class is extending its functionality with additional methods B The class is creating a sub-class of the specified class C The class is importing functionality from another package
2. 2

   Which is a valid declaration of a constructor for a class named 'Car'?

   A public Car() {} B void Car() {} C Car() {}
3. 3

   What is Encapsulation in Java?

   A The process of binding code and data together into a single unit B The ability of an object to take on multiple forms C The practice of hiding sensitive data from other parts of the program
4. 4

   What is the output of the following code snippet?
   
   public class Test {
   private String name = "John";
   public String getName() {
   return name;
   }
   public static void main(String[] args) {
   Test test = new Test();
   System.out.println(test.getName());
   }
   }

   A John B null C Compilation error
5. 5

   How is a static method different from a non-static method?

   A A static method can be called without creating an instance of the class B A non-static method is not part of the class blueprint C A static method can only be called on an instance of the class
6. 6

   Which principle of Object-Oriented Programming does the following code demonstrate?
   
   interface Drawable {
   void draw();
   }
   class Circle implements Drawable {
   public void draw() {
   // Draw Circle
   }
   }

   A Inheritance B Encapsulation C Polymorphism
7. 7

   If a method is marked as 'protected', where can it be accessed?

   A Within the same class only B Within any class in the same package and subclasses in other packages C From anywhere in the application
8. 8

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

   A To call a method of the parent class B To call a method of the superclass's superclass C To increase the priority of a thread
9. 9

   Which of the following is an example of method overloading?

   A Two methods with the same name in the same class, with different return types B Two methods with the same name and parameters in two different classes C Two methods with the same name in the same class, with different parameters
10. 10

    What happens when an 'abstract' class is instantiated in Java?

    A The program compiles successfully B A default constructor is created C A compilation error occurs