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Java Program to Round a Number to n Decimal Places

Floating-point numbers are decimal values, which can be rounded to n number of decimal places. There are 3 different ways to Round a Number to n Decimal Places in Java as follows:

Using format Method
Using DecimalFormat Class
Multiply and Divide the number by 10ⁿ (n decimal places)

Example:

Input: number = 1.41421356237, round = 3 Output:1.414Input: number = 0.70710678118, round = 2 Output:0.71

Method 1: Using format Method

The decimal number can be rounded by the inbuilt format() method supported by Java.

Syntax:

System.out.format("%.df", number);

Parameters: The first parameter accepts d digits to round off the number, the second argument accepts a number that is to be rounded.

Example:

Java

Method 2: Using DecimalFormat Class

DecimalFormat is a child class of the NumberFormat which is used to perform formatting of decimal numbers in java.

We create an object of this class and pass in as arguments the format specified in form o

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