Discover the Easiest Way for Finding Out the LCM of Two Numbers in Java – With Ready-to-Use Code Examples

Table of content

  1. Introduction
  2. What is LCM?
  3. Need for Finding LCM in Java
  4. Basic LCM Calculation Method in Java
  5. Improved Method for Finding LCM in Java
  6. Code Examples for Finding LCM in Java
  7. Conclusion
  8. References


Hey there, fellow Java enthusiasts! Have you ever found yourself stuck on finding the LCM of two numbers in Java? Fear not, for I have discovered the easiest way to solve this problem – and I'm ready to share it with you!

For those who may be unfamiliar, LCM stands for "Least Common Multiple," and it refers to the smallest number that is a multiple of two or more numbers. While there are a few different methods for finding the LCM, I've found a nifty trick that makes the process super simple.

In this article, I'll be walking you through how to find the LCM of two numbers in Java using a few lines of code. Even if you're a beginner to the language, don't worry – I'll break everything down step-by-step. Trust me, once you see how amazingd it be to find the LCM with just a few lines of code, you'll wonder how you ever managed to do it without this trick!

What is LCM?

So, you're here to learn about LCM and how amazing it would be to discover the easiest way for finding it out in Java, right? Well, to put it simply, LCM stands for Least Common Multiple.

But what does that even mean, you ask? Well, think of it like this: let's say you have two numbers, 4 and 6. The multiples of 4 are 4, 8, 12, 16, 20, and so on. The multiples of 6 are 6, 12, 18, 24, and so on. As you can see, the smallest multiple that both 4 and 6 have in common is 12. That's the LCM of 4 and 6!

In other words, the LCM is the smallest number that is a multiple of two (or more) numbers. It's a nifty concept that comes in handy in all sorts of mathematical problems, and now you can learn how to find it quickly and easily in Java.

Need for Finding LCM in Java

So, you might be wondering why you would ever need to find the LCM of two numbers in Java. Well, let me tell you – it's actually pretty nifty! LCM stands for "least common multiple," which basically means finding the smallest number that both of your original numbers can divide into evenly.

Why is this useful, you ask? Well, imagine you're working on a project that involves fractions or ratios. LCMs can help you simplify them and make your calculations a lot simpler. Plus, it's just a satisfying feeling to know you can find the LCM of any two numbers thrown your way – how amazing would that be at the next trivia night with your friends?

But fear not – I'm here to help you out with some easy-to-use Java code examples for finding LCMs. Trust me, once you get the hang of it, you'll be able to find LCMs like a pro. Let's dive in!

Basic LCM Calculation Method in Java

Hey there, my tech-savvy friends! In this subtopic, I'm going to walk you through the basic LCM (Least Common Multiple) calculation method in Java. But before I dive in, let me quickly refresh your memory on what LCM is.

LCM is the smallest common multiple of two or more numbers. This means it's the smallest number that both of your numbers can divide into evenly. For example, the LCM of 3 and 5 is 15 because it's the smallest multiple that they share in common.

Now, let's talk about how we can find the LCM of two numbers in Java. You can either use a method that calculates the LCM by the prime factorization method or through the use of the GCD (Greatest Common Divisor). However, in this post, I'll focus on the GCD method.

The basic approach for finding the LCM of two numbers using the GCD method is to multiply the two input numbers and divide that product by their GCD.

Here's some nifty code that you can use to find the LCM of any two numbers in Java:

public static int findLCM(int num1, int num2) {
    int minMultiple = (num1 > num2) ? num1 : num2;
    while(true) {
        if( minMultiple % num1 == 0 && minMultiple % num2 == 0 ) {
            return minMultiple;

In the code, we declare a method called findLCM() and pass in two integer arguments num1 and num2. We then initialize the minMultiple variable to the larger of the two integers.

Our while loop continues until we find the smallest multiple which is divisible by both num1 and num2. Inside the while loop, we use an if statement to check if minMultiple is divisible by both of the input numbers. If it is, we return the LCM (which is the minMultiple).

That's it! You now have a simple, yet effective method to calculate the LCM of any two numbers in Java. How amazingd that be?

Improved Method for Finding LCM in Java

Now, let's talk about an . Are you ready to make your code a little niftier? Let's do this!

One way to improve your LCM-finding code is to use the GCD (Greatest Common Divisor) method. This method utilizes the fact that the product of the GCD and LCM of two numbers is equal to the product of the two numbers.

So, you can use the following formula to find the LCM of two numbers a and b:

LCM(a,b) = (a*b)/GCD(a,b)

Here's an example of how this would look in Java:

public static int getLCM(int a, int b) {
    int gcd = getGCD(a, b);
    return (a*b)/gcd;

public static int getGCD(int a, int b) {
    if (b==0) {
        return a;
    } else {
        return getGCD(b, a%b);

I know, how amazing would it be if everything in life was this simple? Using the GCD method not only makes the code more efficient, but it also improves its readability. Go ahead and give it a try, and see for yourself how easy it is to find the LCM of two numbers in Java!

Code Examples for Finding LCM in Java

Alrighty, now let's get into the nitty-gritty of finding the LCM of two numbers in Java with some ready-to-use code examples. I'll be honest, I used to dread LCM problems in math class, but with Java, it's a breeze! With just a few lines of code, we can find the LCM of any two numbers.

Here's a quick example using the brute force method:

public static int findLCM(int num1, int num2) {
   int max = Math.max(num1, num2);
   while(true) {
       if(max % num1 == 0 && max % num2 == 0) {
           return max;

Easy peasy, right? We simply find the maximum of the two numbers and then loop through all the numbers after that to find the first one that divides both numbers evenly. This method works well for small numbers, but can become quite slow for larger ones.

Another nifty trick is to use the formula:

LCM = (num1 * num2) / GCD(num1, num2)

Where GCD is the Greatest Common Divisor of the two numbers. Here's the code for that:

public static int findLCM(int num1, int num2) {
    return (num1 * num2) / findGCD(num1, num2);

public static int findGCD(int num1, int num2) {
    if(num2 == 0) {
        return num1;
    return findGCD(num2, num1 % num2);

How amazing is it that we can just plug in those two simple formulas and get the LCM in a jiffy? Java makes math so much more fun and less daunting!

So there you have it, my friends – some super handy code examples for finding the LCM of two numbers in Java. Happy coding!


In , I hope that this article has helped you understand not only what LCM is, but also how to find it using Java. Remember to keep the steps we've discussed in mind: find the prime factors of both numbers, identify the common prime factors, and multiply them together to get the LCM.

But the best part? We've provided some ready-to-use code examples, so you don't even have to worry about coding it all from scratch! How nifty is that?

Learning how to find the LCM of two numbers may seem like a small task in the grand scheme of things, but it's always good to have these fundamental programming abilities under your belt. Plus, who knows? Maybe one day you'll be working with an algorithm that requires LCM and you'll surprise yourself with how amazing it is that you already know how to do it. Happy coding!


If you're looking for more information on finding out the LCM of two numbers in Java, you might want to head to some to help you out. After all, it's always nifty to have a few extra resources up your sleeve! Some great places to start include Java documentation, online forums or communities, and programming textbooks.

Java documentation can often provide in-depth explanations of various code functions and methods, making it a great resource for learning more about a particular language feature. Online communities like Stack Overflow can also be incredibly helpful for finding tips and solutions to specific programming problems or questions.

If you're more of a traditional learner, textbooks might be the way to go. Nowadays, you can find e-books and PDFs of programming textbooks that cover a wide range of topics, and some even have exercises and example code that you can use to sharpen your skills.

At the end of the day, it's all about finding what works best for you! With so many resources available, how amazingd it be if you could find the perfect reference that helps you elevate your Java programming skills to the next level?

As a senior DevOps Engineer, I possess extensive experience in cloud-native technologies. With my knowledge of the latest DevOps tools and technologies, I can assist your organization in growing and thriving. I am passionate about learning about modern technologies on a daily basis. My area of expertise includes, but is not limited to, Linux, Solaris, and Windows Servers, as well as Docker, K8s (AKS), Jenkins, Azure DevOps, AWS, Azure, Git, GitHub, Terraform, Ansible, Prometheus, Grafana, and Bash.

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