Instead of the modulo operator, which has slightly different semantics, for non-negative integers, you can use the remainder operator %. For your exact example:
if ((a % 2) == 0)
{
isEven = true;
}
else
{
isEven = false;
}
This can be simplified to a one-liner:
isEven = (a % 2) == 0;
Baeldung
baeldung.com › home › java › core java › the modulo operator in java
The Modulo Operator in Java | Baeldung
September 3, 2025 - Using the modulo operator, we prevent writeIndex from falling out of the boundaries of the array; therefore, we’ll never get an ArrayIndexOutOfBoundsException. However, once we insert more than QUEUE_CAPACITY items, the next item will overwrite the first. In cases where the dividend is negative, Java returns a negative remainder:
Top answer 1 of 16
387
Instead of the modulo operator, which has slightly different semantics, for non-negative integers, you can use the remainder operator %. For your exact example:
if ((a % 2) == 0)
{
isEven = true;
}
else
{
isEven = false;
}
This can be simplified to a one-liner:
isEven = (a % 2) == 0;
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111
Here is the representation of your pseudo-code in minimal Java code;
boolean isEven = a % 2 == 0;
I'll now break it down into its components. The modulus operator in Java is the percent character (%). Therefore taking an int % int returns another int. The double equals (==) operator is used to compare values, such as a pair of ints and returns a boolean. This is then assigned to the boolean variable 'isEven'. Based on operator precedence the modulus will be evaluated before the comparison.
How does the modulus operator work?
This is, in Java code, what the computer actually does: while(a >= b) { a -= b; } return a; //Remainder It simply subtracts b from a until it can't subtract b from a without a going into negative. It then returns the remainder. It's useful to see for example if a number is even. x % 2 will return a remainder of 1 for all odd numbers and 0 for all even numbers. This is why you often see code like boolean even = x % 2 == 0; in code. More on reddit.com
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September 19, 2015Using the modulo operator in java - Stack Overflow
I'd like to ask about using the modulus operation, could someone tell me how to use an if statement, why use [== 0], but we can assign the value from a modulus calculation into another variable. Why More on stackoverflow.com
What is the difference between modulus and divide symbol in java(% and /)? | Core Java Forum
The modulo operator would return 1, while the divide operator would return 3. ... public class Class2 { public static void main(String[] args) { int a = 10; int b = 3; int remainder = a % b; int quotient = a / b; System.out.println("Remainder: " + remainder); System.out.println("Quotient: " + quotient); } } We offer online classes and lifetime videos access of Core Java... More on javaspringhibernate.com
The Modulus Operator is Powerful!
It's also useful for shrinking stuff if possible, like if some problem wants you to execute an algorithm up to thousands of times that would end up in the same results some of the times. Like there are some LeetCode problems that would have you rotate an array however many times the user specifies, but if they want you to return an array of length 5 after rotating it 2,001 times, that would give the same answer as just doing it 1 time. 2000 % 5. Cool stuff! More on reddit.com
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May 12, 2022Videos
GeeksforGeeks
geeksforgeeks.org › java › modulo-or-remainder-operator-in-java
Modulo or Remainder Operator in Java - GeeksforGeeks
January 24, 2026 - The modulo operator (%) in Java is an arithmetic operator used to find the remainder after division of one number by another.
iO Flood
ioflood.com › blog › java-modulus-modulo
Java Modulus/Modulo: Your Guide to Remainder Operations
February 29, 2024 - The % operator performs the modulus operation and the result, ‘1’, is printed out. In Java, the modulus operation is implemented using the % operator. This operator returns the remainder of a division operation.
IONOS
ionos.com › digital guide › websites › web development › java modulo
How to use the Java modulo operator - IONOS
December 18, 2024 - The Java modulo operator allows you to easily determine the remainder from a division operation. We show you how the operator works using examples.
Reddit
reddit.com › r/javahelp › how does the modulus operator work?
r/javahelp on Reddit: How does the modulus operator work?
September 19, 2015 -
I apologise in advance if this is a stupid question, but I've looked everywhere and every explanation I've found has been way above my pay grade.
I've been studying java for a grand total of one week. My lecturer gave us notes that cover the modulus, but after reading them I'm still none the wiser. The examples he gives don't seem consistent and I'm just getting more and more confused.
The exercise involves trying convert 174 pounds into stone and pounds using the modulus, but I honestly have no idea where the modulus goes or how it works, or what numbers I'm supposed to put where. I'd be grateful for literally any explanation at this point.
Top answer 1 of 4
4
This is, in Java code, what the computer actually does: while(a >= b) { a -= b; } return a; //Remainder It simply subtracts b from a until it can't subtract b from a without a going into negative. It then returns the remainder. It's useful to see for example if a number is even. x % 2 will return a remainder of 1 for all odd numbers and 0 for all even numbers. This is why you often see code like boolean even = x % 2 == 0; in code.
2 of 4
1
Hi! I think this site explains the modulo operator quite well. The gist of using the operator is to grab the remainder of two numbers. For example, 10 % 3 would give a result of 1 because 10 divided by 3 leaves a remainder of 1. Hope that helps.
Codedamn
codedamn.com › news › java
What is Modulo/Modulus/Remainder Operator In Java?
November 20, 2023 - Java, with its widespread use in ... in handy is the modulo operator, denoted by the % sign. It provides the remainder of a division operation between two numbers....
Runestone Academy
runestone.academy › ns › books › published › apcsareview › VariableBasics › operators.html
3.5. Operators — AP CSA Java Review - Obsolete
When Java sees you doing integer ... operator (%) is the modulo or remainder operator. The modulo operator (x % y) returns the remainder after you divide x (first number) by y (second number) so 5 % 2 will return 1 since 2 goes into 5 two times with a remainder of ...
W3Schools
w3schools.com › java › java_operators_arithmetic.asp
Java Arithmetic Operators
Java Examples Java Videos Java Compiler Java Exercises Java Quiz Java Code Challenges Java Server Java Syllabus Java Study Plan Java Interview Q&A Java Certificate ... Arithmetic operators are used to perform common mathematical operations.
Medium
medium.com › @AlexanderObregon › what-is-javas-modulo-and-how-to-use-it-10e8e464d974
What Is Java’s Modulo (%) and How to Use It | Medium
April 1, 2025 - The % symbol in Java is often called the modulo operator, but in technical terms, it’s more accurate to think of it as a remainder operator. That small detail makes a big difference in how it behaves, especially when you start working with negative numbers or floating-point values.
Codecademy
codecademy.com › forum_questions › 4fe7cabea0dbcb00030053b4
Modulo and if/else | Codecademy
I played around in another section with the modulo and if/else statements and was able to return a ‘false’ value whenever the modulo returned a value of 0 remainder, and anytime the formula had a positive integer returned it allowed for a ‘true’ value to be computed (as in 12%2 versus 12%7). I played around with some other numbers and, while by no means exhaustive, this seems to hold true. My question, then, should have been whether this is the always the case when using java or if it is a result that is unique to this site and if it is always the case, is it more detailed or is it really simply a case of a remainder of 0 returning a ‘false’ value and any integer returning a ‘true’ value?
Top answer 1 of 2
1
number % 2 is an expression that can't be evaluated to a boolean by any means.
15.17.3. Remainder Operator %
The binary % operator is said to yield the remainder of its operands from an implied division; the left-hand operand is the dividend and the right-hand operand is the divisor.
https://docs.oracle.com/javase/specs/jls/se12/html/jls-15.html#jls-15.17.3
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The modulus operator returns an int, in this case but it could return a double or long depending on the operands. An if statement requires a boolean. So the reason why you can't do if(number % 2) is because there is no boolean. With if(number % 2 == 0) you are checking if the result of the modulo operator is zero, which is a boolean.
Coderanch
coderanch.com › t › 785725 › java › Modulus-Operator
Modulus Operator (Java in General forum at Coderanch)
mathsisfun.com wrote:The modulo (or "modulus" or "mod") is the remainder after dividing one number by another. Now let's apply that to your example Which means 1 mod 2. That's 1 divided by 2 which is 0, with a remainder of 1. So the result of that operation is 1.
Whizdom Trainings
javaspringhibernate.com › core-java-training › forum › 7841 › what-is-the-difference-between-modulus-and-divide-symbol-in-java-and
What is the difference between modulus and divide symbol in java(% and /)? | Core Java Forum
April 13, 2024 - In Java, modulo operator(%) returns the remainder of a division operation · while the divide operator returns the quotient of a division operation. For example, if you divide 10 by 3, the result is 3 with a remainder of 1. The modulo operator ...
Edureka
edureka.co › blog › mod-method-in-java
Modulus in Java | Remainder or Modulus Operator in Java | Edureka
July 5, 2024 - Modulus in Java is an Operator. % is also known as the modulus or remainder operator. The % operator returns the remainder of two numbers
Xperti
xperti.io › home › how to use modulo, modulus, or remainder operator in java?
How To Use Mod Operator In Java
August 17, 2022 - That was all about how to use the mod operator in Java. The modulo operator is used to find the remainder of an integer division that cannot be calculated by any other operator.
Quora
quora.com › Can-you-explain-the-differences-between-mod-and-in-Java
Can you explain the differences between mod and % in Java? - Quora
Answer: It is basically the same thing. By mod, i presume you are referring to the mod in python. Mod is going to return the remainder. In the same way the % sign which we call modulus in java returns the remainder. We use them in the same way as well
LabEx
labex.io › tutorials › java-modulo-operator-in-java-117974
Mastering the Modulo Operator in Java | LabEx
The Modulo operator is a mathematical ... represented by the symbol %. In Java, the modulo operator returns the remainder of dividing the first number by the second number....
Coderanch
coderanch.com › t › 401943 › java › isn-mod
% isn't really mod, is it? (Beginning Java forum at Coderanch)
January 3, 2006 - -Adam[/QB] Ok - now that I look at it some more, I see that it actually does exactly what I would have expected, and it is still the c/++/java output that sticks out. ... In terms of mathematical correctness, modular arithemetic is defined on a ring such that in the example -12 modulo 10, the class of numbers defined by -2 is congruent to the class of numbers defined by 8. Meaning on the ring 10, all arithmetic operations would be the same regardles of which number you chose, -2 or 8, for the operation Java picks the least most positive number for the ring, which is also what you commonly use to represent that class of numbers in mathematics, ie, -12, -2, 8, 18, and 28 on ring 10 would be represented as {8}.
Studytonight
studytonight.com › java-examples › modulo-operator-in-java
Modulo Operator in Java - Studytonight
August 5, 2021 - More Tutorials... ... MCQs to test your knowledge. ... Compilers to execute code in browser. ... Learn Coding! ... The Modulo operator is used to find the remainder of the division of two numbers.