Learn to Remove Those Pesky Decimal Points in Java, With Easy Code Examples

Table of content

  1. Introduction
  2. Understanding Decimal Points in Java
  3. Why Remove Decimal Points in Java?
  4. Methods to Remove Decimal Points
  5. Code Examples
  6. Conclusion
  7. References


Welcome to the world of Java programming! As with any new programming language, there are always challenges to overcome, and one of those challenges is working with decimal points. If you're new to Java, you may find it frustrating to deal with decimal points in your code, but fear not! In this article, we'll guide you through the process of removing those pesky decimal points in Java, and show you some easy code examples to get you started.

Before we dive into the examples, it's important to note that Java provides different approaches to handling decimal points, depending on your programming needs. You can choose to round your decimals up or down, or you can choose to truncate them altogether. Depending on your program's specific requirements, one option may be better suited than the others.

In the following sections, we'll provide you with some simple code examples that demonstrate how to remove decimal points in Java. We'll cover the basics of the BigDecimal class, which is a part of the Java core library that provides methods for working with arbitrary-precision decimal numbers.

So, whether you're a complete beginner or an experienced Java programmer looking to polish your skills, read on to learn how to remove those pesky decimal points in Java!

Understanding Decimal Points in Java

Decimal points may seem like a trivial aspect of programming, but they can become a major source of frustration if you are not familiar with how they work in Java. Decimal points, also known as floating-point numbers, are essential for performing precise calculations in Java. However, they can also lead to unwanted results if not properly handled.

Decimal points in Java are represented by the data type “double”, which can hold decimal numbers up to 15 digits long. The precision of the number is dependent on the length of the decimal. For example, a double with a length of 5 can represent a number to 5 decimal places. This makes it critical to choose the correct data type for your calculations to ensure accurate results.

One common problem that arises with decimal points is the presence of trailing digits. This can occur when performing calculations that result in a long decimal with many digits after the point. In Java, this can be fixed by using the “DecimalFormat” class, which provides options for formatting and rounding decimal numbers to a desired precision.

By understanding how decimal points work in Java, you can avoid common pitfalls and improve the accuracy of your calculations. Keep in mind that using the appropriate data type and formatting your results can make a significant difference in the success of your program.

Why Remove Decimal Points in Java?

When working with Java, you may come across situations where you need to remove decimal points from a number. There are several reasons why you might need to do this. For example, you may need to format a number for display purposes or perform calculations that require integers instead of floats.

Removing decimal points in Java is a simple process that can be achieved using a few lines of code. However, it's important to understand that the way you choose to remove decimal points will depend on your specific needs and the context in which you are working.

It's worth noting that Java provides several methods for formatting and manipulating numbers, so you should take some time to become familiar with the various options available to you. By doing so, you will be able to choose the most appropriate method for your particular use case and avoid wasting time and effort trying to implement a solution that doesn't work for your needs.

In conclusion, understanding how to remove decimal points in Java is an essential skill for any Java developer. Whether you are working on a project that requires formatting numbers for display or performing calculations that require integers rather than floats, knowing the right method to use can save you time and effort in the long run. So take some time to explore the options available to you and experiment to find the most effective solution for your needs.

Methods to Remove Decimal Points

Removing decimal points from Java code may seem like a complex task at first, but it is actually quite simple once you learn the methods. Here are a few methods that you can use to remove decimal points from your Java code:

Method 1: Type Conversion

The easiest method to remove decimal points from a decimal number in Java is by using type conversion. You can convert the decimal number to an integer by casting it, which will remove the decimal points. Here's an example code snippet:

double number = 3.1415926;
int integer = (int) number;

System.out.println(integer); // Output: 3

Method 2: DecimalFormat Class

The DecimalFormat class is a built-in class in Java that allows you to format decimal numbers. You can use the setRoundingMode() method of the DecimalFormat class to set the rounding mode to RoundingMode.DOWN, which will remove decimal points. Here's an example code snippet:

import java.text.DecimalFormat;
import java.math.RoundingMode;

double number = 3.1415926;
DecimalFormat df = new DecimalFormat("#");


String result = df.format(number);
int integer = Integer.parseInt(result);

System.out.println(integer); // Output: 3

Method 3: String Manipulation

Another method to remove decimal points in Java is to convert the decimal number to a String and manipulate the String to remove the decimal points. You can use the indexOf() method to find the position of the decimal point and use the substring() method to extract the digits before the decimal point. Here's an example code snippet:

double number = 3.1415926;
String string = Double.toString(number);

int index = string.indexOf(".");
String result = string.substring(0, index);

int integer = Integer.parseInt(result);

System.out.println(integer); // Output: 3

By using any one of these methods, you can easily remove decimal points from a decimal number in Java. Experiment with these methods and see which one works best for your specific use case. Happy coding!

Code Examples

Now that you have a basic understanding of how to remove decimal points in Java, it's time for some ! These examples will help you get a better grasp on how to implement the concepts we discussed earlier.

Example 1: Using Formatting Strings

double num = 3.14159;
System.out.printf("The answer is %.0f", num);

This code will output: "The answer is 3". The "f" in "%.0f" tells Java that we want to output a float value, and the ".0" specifies that we want to output it with 0 decimal places.

Example 2: Using the Math.floor() Method

double num = 3.14159;
int roundedNum = (int) Math.floor(num);
System.out.println("The answer is " + roundedNum);

This code will output: "The answer is 3". The Math.floor() method rounds a double down to the nearest integer, and we then cast that integer to an int to get rid of any remaining decimal places.

Example 3: Using the DecimalFormat Class

double num = 3.14159;
DecimalFormat df = new DecimalFormat("#");
System.out.println("The answer is " + df.format(num));

This code will output: "The answer is 3". The DecimalFormat class allows us to format numbers in various ways, and the "#" symbol in the format string tells Java that we want to output the number without any decimal places.

These examples should give you a good idea of how to remove decimal points in Java. Feel free to experiment with different formats and methods to see what works best for you!


In , removing decimal points in Java is an important skill to have as a programmer. Whether you're dealing with financial calculations, scientific data, or other applications, knowing how to round or truncate numbers can be critical to the accuracy and usability of your programs. With the easy-to-follow code examples we've provided, you should be well on your way to mastering this technique.

But remember, learning a programming language is not just about memorizing syntax or copying code from tutorials. It's about understanding the underlying concepts and applying them in practice. So don't be afraid to experiment, make mistakes, and ask questions. Join online communities, attend meetups or conferences, and immerse yourself in the world of Java programming.

Also, keep in mind that there are many resources available for learning Java, from official documentation to free online courses and interactive tutorials. Don't waste your time and money on outdated books or overly complex IDEs. Focus on mastering the basics first, and build from there.

In short, learning how to remove decimal points in Java is just one example of the many skills you'll need as a successful programmer. By taking a systematic and disciplined approach to learning, and by staying engaged with the programming community, you'll be well-equipped to tackle any challenge that comes your way. Happy coding!


are an essential aspect of programming in Java (and most other programming languages). They provide a way to refer to a memory location in your program and access the information stored there. Understanding is important because it allows you to manipulate and work with data more efficiently.

In Java, variables of primitive types like int, float, and double hold their values directly. However, variables of reference types like String, List, and Map hold a reference to an object in memory. This means that when you assign a reference variable to another variable or pass it to a method, you are actually copying the reference to the same object in memory.

When you're dealing with decimal numbers in Java, you may encounter situations where you need to round or truncate them to a certain number of decimal places. This can be accomplished using a variety of methods such as Math.round(), DecimalFormat, or BigDecimal. However, if you simply want to remove the decimal points and convert the number to an integer, you can use the intValue() method.

For example, suppose you have a floating-point variable pi that contains the value 3.14159. If you want to convert this value to an integer by removing the decimal places, you can do this:

double pi = 3.14159;
int intPi = (int) pi;

The cast operator (int) converts the floating-point value to an integer by truncating the decimal places. The resulting value stored in intPi is 3.

Remember that when you truncate the decimal places, you may lose some precision in the value. Be sure to consider the implications of this in your code.

As always, experimenting with code examples like these will help you gain a better understanding of Java programming. Keep practicing and have fun!

My passion for coding started with my very first program in Java. The feeling of manipulating code to produce a desired output ignited a deep love for using software to solve practical problems. For me, software engineering is like solving a puzzle, and I am fully engaged in the process. As a Senior Software Engineer at PayPal, I am dedicated to soaking up as much knowledge and experience as possible in order to perfect my craft. I am constantly seeking to improve my skills and to stay up-to-date with the latest trends and technologies in the field. I have experience working with a diverse range of programming languages, including Ruby on Rails, Java, Python, Spark, Scala, Javascript, and Typescript. Despite my broad experience, I know there is always more to learn, more problems to solve, and more to build. I am eagerly looking forward to the next challenge and am committed to using my skills to create impactful solutions.

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