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BAEL-821 New class that shows different rounding techniques. Updated POM.

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This commit is contained in:
iaforek 2017-05-30 09:57:12 +01:00
parent 4033449580
commit 6d407f88a3
2 changed files with 45 additions and 0 deletions
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7
core-java/pom.xml
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@ -45,6 +45,12 @@
<artifactId>commons-math3</artifactId>
<version>${commons-math3.version}</version>
</dependency>
<dependency>
<groupId>org.decimal4j</groupId>
<artifactId>decimal4j</artifactId>
<version>${decimal4j.version}</version>
</dependency>
<dependency>
<groupId>org.bouncycastle</groupId>
@ -369,6 +375,7 @@
<bouncycastle.version>1.55</bouncycastle.version>
<commons-codec.version>1.10</commons-codec.version>
<commons-math3.version>3.6.1</commons-math3.version>
<decimal4j.version>1.0.3</decimal4j.version>
<commons-io.version>2.5</commons-io.version>
<commons-collections4.version>4.1</commons-collections4.version>
<collections-generic.version>4.01</collections-generic.version>

38
core-java/src/main/java/com/baeldung/maths/Round.java Normal file
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@ -0,0 +1,38 @@
package com.baeldung.maths;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import org.apache.commons.math3.util.Precision;
import org.decimal4j.util.DoubleRounder;
public class Round {
private static final double PI = 3.1415d;
public static void main (String args[]) {
System.out.println("PI: " + PI);
System.out.printf("Value with 3 digits after decimal point %.3f %n", PI);
// OUTPUTS: Value with 3 digits after decimal point 3.142
DecimalFormat df = new DecimalFormat("###.###");
System.out.println(df.format(PI));
System.out.println(round(PI, 3));
System.out.println(roundOptional(PI, 3));
System.out.println(Precision.round(PI, 3));
System.out.println(DoubleRounder.round(PI, 3));
}
public static double round(double value, int places) {
if (places < 0) throw new IllegalArgumentException();
BigDecimal bd = new BigDecimal(value);
bd = bd.setScale(places, RoundingMode.HALF_UP);
return bd.doubleValue();
}
public static double roundOptional(double value, int places) {
double scale = Math.pow(10, places);
double rounded = Math.round(value * scale) / scale;
return rounded;
}
}