Java Basics

1.		Which keyword is used to declare a variable in Java?

var

let

int

def

2.		Which of the following is NOT a valid identifier in Java?

myVariable

$variable

2variable

_variable

3.		Which of the following is NOT a primitive data type in Java?

int

boolean

double

string

4.		Which of the following is NOT a primitive data type in Java?

int

boolean

double

string

5.		What is the output of the following code? public class Test { public static void main(String args[]) { int x = 5; int y = 2; System.out.println(x / y); } }

2

2.5

2

None of the above

6.		What is Java?

A programming language

An operating system

A database management system

A web browser

7.		What is the output of the following code? public class Test { public static void main(String args[]) { String name = "Java"; System.out.println(name.substring(1, 3)); } }

Ja

av

Jav

No output

8.		Which of the following is a valid way to declare an array in Java?

int[] numbers = {1, 2, 3};

int numbers[] = {1, 2, 3};

int numbers = {1, 2, 3};

Both A and B

9.		What is the output of the following code? public class Test { public static void main(String args[]) { String name = "Java"; for(int i = 0; i < name.length(); i++) { System.out.print(name.charAt(i) + " "); } } }

J a v a

Java

Jv

No output

10.		What is the output of the following code? public class Test { public static void main(String args[]) { System.out.println("Hello" + " World"); }

Hello

World

Hello World

HelloWorld