Java example program to round double to 2 decimal places

• To round the decimal number in java we have DecimalFormat class in java.
• By using DecimalFormat class format() method we can round double or float number to N decimal places.
• Lets see a java program on how to round double to 2 decimal places.

 Java Program to round double number to 2 / 3 decimal places.

1. package com.javarounddecimal;
2. import java.text.DecimalFormat;
3.  
4. public class RoundDecimal {
5.     /**
6.      * java round double to 2 decimal places
7.      * @author www.instanceofjava.com
8.      */
9.     public static void main(String[] args) {
10.         
11.         double number = 12.3712377;
12.         DecimalFormat df1 = new DecimalFormat("#.##");
13.         System.out.println(number + " is rounded to: " + df1.format(number));
14.          
15.         DecimalFormat df2 = new DecimalFormat("#.###");
16.         System.out.println(number + " is rounded to: " + df2.format(number));
17.          
18.         number = 12.388654;
19.         
20.         DecimalFormat df3 = new DecimalFormat("#.##");
21.         System.out.println(number + " is rounded to: " + df3.format(number));
22.        
23.         
24.         DecimalFormat df4 = new DecimalFormat("#.###");
25.         System.out.println(number + " is rounded to: " + df4.format(number));
26.  
27.     }
28.  
29. }

 Output:

1. 12.3712377 is rounded to: 12.37
2. 12.3712377 is rounded to: 12.371
3. 12.388654 is rounded to: 12.39
4. 12.388654 is rounded to: 12.389

  Java Program to round float number to 2 / 3 decimal places.

Output:

1. 12.371238 is rounded to: 12.37
2. 12.371238 is rounded to: 12.371
3. 12.388654 is rounded to: 12.39
4. 12.388654 is rounded to: 12.389