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Java Basics and Identifiers

Here are 10 essential multiple-choice questions on Java Basics and Identifiers, covering key concepts with practical examples.

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Question 1

What is the correct way to declare a Java main method?

public static void Main(String[] args)
public void main(String args)
public static void main(String[] args)
private static void main(String args[])

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Question 2

Which of the following is NOT a valid Java identifier?

_myVar
2ndVariable
$amount
myVariable123

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Question 3

What is the output of the following Java program?

Java

public class Geeks {
    public static void main(String[] args) {
        int number = 10;
        System.out.println(Number);
    }
}

10
Compilation Error
Runtime Error
Undefined Behavior

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Question 4

Which of the following is NOT a valid Java keyword?

class
define
this
final

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Question 5

How many keywords are there in Java (as of Java 17)?

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Question 6

What will be the output of the following Java snippet?

Java

public class Geeks {
    static int $count = 5;
    public static void main(String[] args) {
        System.out.println($count);
    }
}

5
Compilation Error
Runtime Error
Undefined Behavior

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Question 7

Which statement about Java identifiers is FALSE?

Identifiers are case-sensitive
Identifiers can contain spaces
Identifiers can begin with _ or $
Identifiers cannot be Java keywords

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Question 8

What is the output of the following Java program?

Java

public class Main {
    public static void main(String[] args) {
        int my_var = 20;
        System.out.println(my_var);
    }
}

20
Compilation Error
Runtime Error
Undefined Behavior

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Question 9

What will happen if you use a Java keyword as an identifier?

Compilation Error
No Error
Runtime Error
The keyword will be ignored

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Question 10

Which of the following is a valid identifier in Java?

123abc
@value
myVariable
void

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