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Change project from java-numbers to java-numbers-3

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This commit is contained in:
Marcin Krykowski
2020-05-30 05:22:10 +01:00
parent a34da64e71
commit d697e7f7d5
2 changed files with 3 additions and 1 deletions
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43
java-numbers/src/main/java/com/baeldung/formatNumber/FormatNumber.java
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@@ -1,43 +0,0 @@
package com.baeldung.formatNumber;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Locale;
public class FormatNumber {
public static double withBigDecimal(double value, int places) {
if (places < 0)
throw new IllegalArgumentException();
BigDecimal bigDecimal = new BigDecimal(value);
bigDecimal = bigDecimal.setScale(places, RoundingMode.HALF_UP);
return bigDecimal.doubleValue();
}
public static double withMathRound(double value, int places) {
double scale = Math.pow(10, places);
return Math.round(value * scale) / scale;
}
public static double withDecimalFormatPattern(double value, int places) {
DecimalFormat df2 = new DecimalFormat("#,###,###,##0.00");
DecimalFormat df3 = new DecimalFormat("#,###,###,##0.000");
if (places == 2)
return new Double(df2.format(value));
else if (places == 3)
return new Double(df3.format(value));
else
throw new IllegalArgumentException();
}
public static double withDecimalFormatLocal(double value) {
DecimalFormat df = (DecimalFormat) NumberFormat.getNumberInstance(Locale.getDefault());
return new Double(df.format(value));
}
public static String withStringFormat(double value, int places) {
return String.format("%." + places + "f", value);
}
}

37
java-numbers/src/test/java/com/baeldung/formatNumber/FormatNumberUnitTest.java
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@@ -1,37 +0,0 @@
package com.baeldung.formatNumber;
import org.junit.Test;
import static com.baeldung.formatNumber.FormatNumber.*;
import static org.assertj.core.api.Assertions.*;
public class FormatNumberUnitTest {
private static final double D = 4.2352989244d;
private static final double F = 8.6994540927d;
@Test public void givenDecimalNumber_whenFormatNumberToNDecimalPlaces_thenGetExpectedResult() {
assertThat(withBigDecimal(D, 2)).isEqualTo(4.24);
assertThat(withBigDecimal(D, 3)).isEqualTo(4.235);
assertThat(withBigDecimal(F, 2)).isEqualTo(8.7);
assertThat(withBigDecimal(F, 3)).isEqualTo(8.699);
assertThat(withMathRound(D, 2)).isEqualTo(4.24);
assertThat(withMathRound(D, 3)).isEqualTo(4.235);
assertThat(withMathRound(F, 2)).isEqualTo(8.7);
assertThat(withMathRound(F, 3)).isEqualTo(8.699);
assertThat(withStringFormat(D, 2)).isEqualTo("4.24");
assertThat(withStringFormat(D, 3)).isEqualTo("4.235");
assertThat(withStringFormat(F, 2)).isEqualTo("8.70");
assertThat(withStringFormat(F, 3)).isEqualTo("8.699");
assertThat(withDecimalFormatLocal(D)).isEqualTo(4.235);
assertThat(withDecimalFormatLocal(F)).isEqualTo(8.699);
assertThat(withDecimalFormatPattern(D, 2)).isEqualTo(4.24);
assertThat(withDecimalFormatPattern(D, 3)).isEqualTo(4.235);
assertThat(withDecimalFormatPattern(F, 2)).isEqualTo(8.7);
assertThat(withDecimalFormatPattern(F, 3)).isEqualTo(8.699);
}
}