Core Java

1) Which statement is true about Java?

• a) Java is a sequence-dependent programming language

• b) Java is a code dependent programming language

• c) Java is a platform-dependent programming language

• d) Java is a platform-independent programming language

Answer explanation

Explanation: Java is called ‘Platform Independent Language’ as it primarily works on the principle of ‘compile once, run everywhere’.

2) Which one of the following is not a Java feature?

• a) Object-oriented

• b) Use of pointers

• c) Portable

• d) Dynamic and Extensible

Answer explanation

Explanation: Pointers is not a Java feature. Java provides an efficient abstraction layer for developing without using a pointer in Java. Features of Java Programming are Portable, Architectural Neutral, Object-Oriented, Robust, Secure, Dynamic and Extensible, etc.

3) Which environment variable is used to set the java path?

• a) MAVEN_Path

• b) JavaPATH

• c) JAVA

• d) JAVA_HOME

Answer explanation

Explanation: JAVA_HOME is used to store a path to the java installation.

4) What will be the output of the following Java code?

1.  class box 

2. {

3. int width;

4. int height;

5. int length;

6. }

7. class main

8. {

9. public static void main(String args[])

10. {

11. box obj = new box();

12. obj.width = 10;

13. obj.height = 2;

14. obj.length = 10;

15. int y = obj.width obj.height obj.length;

16. System.out.print(y);

17. }

18. }

• a) 100

• b) 400

• c) 200

• d) 12

5) Multiline comment is created using ___.

• 1. a) //

• b) /* */

• c) <!--  -- >

• d) None of these

6) Which of the following is the correct syntax to create a variable in Java?

• a) var name;

• b) int name;

• c) var name int;

• d) All of these

7) What will be the output of following Java code?

public class Main {
  public static void main(String[] args) {
    String str = "Hello";
    str = "Bye";
    System.out.println(str);
  }
}

• a) Hello

• b) Bye

• c) Error

• d) All of these

8) What is type casting in Java?

• a) Casting variable to the class

• b) Creating a new variable

• c) It is converting type of a variable from one type to another

• d) All of these

9) Array in java is ___.

• 1. a) The data type of consisting of characters

• b) Collection of elements of different types

• c) Collection of similar elements

• d) None of these

10) Which of these is the correct method to create an array in java?

• a) int[] arr = {1, 3, 5};

• b) int[] arr;

• c) arr = new int[] {3, 1, 8};

• d) int arr[] = {1, 4, 6};

• e) All of these