In Java, How Can A Number Be Rounded To A Specific Number Of Decimal Places?

To round a number to n decimal places in Java, you can use the DecimalFormat class. Here is an example:

import java.text.DecimalFormat;

public class Main {
    public static void main(String[] args) {
        double number = 3.14159265359;
        int decimalPlaces = 2;

        // Create the decimal format pattern
        String pattern = "#.";
        for (int i = 0; i < decimalPlaces; i++) {
            pattern += "#";
        }

        // Create the decimal format instance
        DecimalFormat decimalFormat = new DecimalFormat(pattern);

        // Format the number
        String roundedNumber = decimalFormat.format(number);

        // Print the rounded number
        System.out.println(roundedNumber);
    }
}

In this example, the number is rounded to 2 decimal places. The DecimalFormat class is used to create a pattern that defines the format of the rounded number. The pattern is created based on the desired number of decimal places (n). The format() method of DecimalFormat is then used to format the number according to the pattern. Finally, the rounded number is printed.

Output:

3.14

About the Author Rex

I'm a passionate tech blogger with an insatiable love for programming! From my early days tinkering with code, I've delved into web dev, mobile apps, and AI. Sharing insights and tutorials with the world is my joy, connecting me to a global community of like-minded tech enthusiasts. Python holds a special place in my heart, but I embrace all challenges. Constantly learning, I attend tech conferences, contribute to open-source projects, and engage in code review sessions. My ultimate goal is to inspire the next generation of developers and contribute positively to the ever-evolving tech landscape. Let's code together!