In this post, we will see how to round double to 2 decimal places in java.
There are many ways to do it.Let’s go through few ways.
Table of Contents
Using DecimalFormat
You can use DecimalFormat too to round number to 2 decimal places.
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package org.arpit.java2blog; import java.text.DecimalFormat; public class DecimalFormatMain { public static void main(String[] args) { double d=2343.5476; DecimalFormat df = new DecimalFormat("###.##"); System.out.println("Rounded double (DecimalFormat) : " + df.format(d)); } } |
Output:
Rounded double (DecimalFormat) : 2343.55
Read also:
Using BigDecimal
You can convert double or float to BigDecimal and use setScale() method to round double/float to 2 decimal places.
Here is the example:
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package org.arpit.java2blog; import java.math.BigDecimal; import java.math.RoundingMode; public class BigDecimalRoundDoubleMain { public static void main(String[] args) { double d = BigDecimalRoundDoubleMain.roundDouble(2343.5476, 2); System.out.println("Rounded Double: "+d); float f = BigDecimalRoundDoubleMain.roundFloat(2343.5476f, 2); System.out.println("Rounded Float: "+f); } private static double roundDouble(double d, int places) { BigDecimal bigDecimal = new BigDecimal(Double.toString(d)); bigDecimal = bigDecimal.setScale(places, RoundingMode.HALF_UP); return bigDecimal.doubleValue(); } private static float roundFloat(float f, int places) { BigDecimal bigDecimal = new BigDecimal(Float.toString(f)); bigDecimal = bigDecimal.setScale(places, RoundingMode.HALF_UP); return bigDecimal.floatValue(); } } |
Output:
Rounded Double: 2343.55
Rounded Float: 2343.55
Rounded Float: 2343.55
Using Math.round(double*100.0)/100.0
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package org.arpit.java2blog; public class MathRoundMain { public static void main(String[] args) { double d=2343.5476; double roundedDouble = Math.round(d * 100.0) / 100.0; System.out.println("Rounded double: "+roundedDouble); float f=2343.5476f; float roundedFloat = (float)Math.round(f * 100.0) / 100.0; System.out.println("Rounded float: "+roundedFloat); } } |
Output:
Rounded double: 2343.55
Rounded float: 2343.55
Rounded float: 2343.55
You must be wondering how this works.
double*100.0 – 234354.76
Math.round(double*100.0) – 234355.00 (round to nearest value)
Math.round(double*100.0)/100.0 – 2343.55
Math.round(double*100.0) – 234355.00 (round to nearest value)
Math.round(double*100.0)/100.0 – 2343.55
Using Apache common Math
You can also use Apache common‘s math library to round double or float to 2 decimal places.
Add the following dependency to pom.xml.
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<dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-math3</artifactId> <version>3.6.1</version> </dependency> |
You can find versions of commons-math over here.
Here is the example:
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package org.arpit.java2blog; import org.apache.commons.math3.util.Precision; public class ApacheMathDoubleMain { public static void main(String[] args) { double d=2343.5476; double roundedDouble = Precision.round(d,2); System.out.println("Rounded double: "+roundedDouble); float f=2343.5476f; float roundedFloat = Precision.round(f, 2); System.out.println("Rounded float: "+roundedFloat); } } |
Rounded Double: 2343.55
Rounded Float: 2343.55
Rounded Float: 2343.55
That’s all about rounding double/float to 2 decimal places
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