JAVA development quiz 1

5. What is the parent class of all classes in Java?

• a) Object

• b) Parent

• c) Base

• d) Root

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

• a) To terminate the program immediately.

• b) To exit from a loop or switch statement.

• c) To skip the current iteration of a loop.

• d) To skip the current case in a switch statement.

9. What is the output of the following code snippet?
   String str = "Hello";

   str.concat(" World");

   System.out.println(str);

• a) Hello
  
  

• b) Hello World

• c) World

• 
  d) Compilation error

8. Which of the following statements is true about Java interfaces?

• a) Interfaces can contain instance variables.

• b) A class can implement multiple interfaces with the same method names.

• c) Interfaces can be instantiated directly.

• d) Interfaces can have constructors.

3. What is the output of the following code snippet?
   String str1 = "hello";

   String str2 = "hello";

   System.out.println(str1 == str2);

• a) true
  
  
  

• b) false

• c) Compilation error

• d) Runtime error

1. What is the output of the following Java code snippet?
   public class Main {

   public static void main(String[] args) {

   int x = 5;

   System.out.println(x++); // Post-increment

   }

   }

• a) 5

• b) 6

• c) Compilation error

• d) Runtime error

2. Which keyword is used to define a constant in Java?
   
   
   

• a) constant

• b) final

• 
  c) static

• d) const

1. Which of the following is not a primitive data type in Java?

• a) int

• b) float

• c) string

• d) boolean

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

• a) To refer to the current class object.

• b) To create a new instance of a class.

• c) To define a constant value.

• d) To refer to the superclass.

6. What is the output of the following code snippet?
   String str = "Java";

   System.out.println(str.length());

• a) 5
  
  
  

• b) 4

• c) 3

• d) Compilation error