Variable in Java MCQs Exercise I

Ques 1 Variable

Which keyword in Java 10 allows you to declare variables without specifying their types explicitly?

A var

B let

C dynamic

D auto

Ques 2 Variable

In Java, variables are case-sensitive. What does this mean?

A Variable names cannot contain uppercase letters.

B Variable names cannot contain lowercase letters.

C Variable names must be in camel case.

D Variable names are distinguished by the use of uppercase and lowercase letters.

Ques 3 Variable

What will be the result of the following code snippet?

int x = 5;
int y = x++;
System.out.println(y);

A 3

B 5

C 7

D Compilation error

Ques 4 Variable

Which of the following statements is true about comments in Java?

A Comments are ignored by the compiler and do not affect the execution of the program.

B Comments are executed as part of the program.

C Comments can only be used to explain the purpose of the program to other programmers.

D Comments are mandatory in every Java program.

Ques 5 Variable

What is the purpose of single-line comments in Java?

A To temporarily disable a piece of code

B To provide documentation for a method or class

C To define a block of code that should be executed

D To improve the performance of the program

Ques 6 Variable

Which of the following is not a valid way to comment out a block of code in Java?

A // code here
// code here

B /* code here /

C /* code here code here */

Java Variable Exercise