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Add formating methods for percentages, currencies and big numbers

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This commit is contained in:
Marcin Krykowski 2020-06-13 23:40:19 +01:00
parent 3396e92d2d
commit e3f7cf6b2c
2 changed files with 71 additions and 0 deletions
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29
java-numbers-3/src/main/java/com/baeldung/formatNumber/FormatNumber.java
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@ -40,5 +40,34 @@ public class FormatNumber {
public static String withStringFormat(double value, int places) { public static String withStringFormat(double value, int places) {
return String.format("%." + places + "f", value); return String.format("%." + places + "f", value);
} }
public static String byPaddingOutZeros(int value, int paddingLength) {
return String.format("%0" + paddingLength + "d", value);
}
public static double withTwoDecimalPlaces(double value) {
DecimalFormat df = new DecimalFormat("#.00");
return new Double(df.format(value));
}
public static String withLongNumbers(double value) {
DecimalFormat df = new DecimalFormat("###,###,###");
return df.format(value);
}
public static String forPercentages(double value, Locale localisation) {
NumberFormat nf = NumberFormat.getPercentInstance(localisation);
return nf.format(value);
}
public static String currencyWithChosenLocalisation(double value, Locale localisation) {
NumberFormat nf = NumberFormat.getCurrencyInstance(localisation);
return nf.format(value);
}
public static String currencyWithDefaultLocalisation(double value) {
NumberFormat nf = NumberFormat.getCurrencyInstance();
return nf.format(value);
}
} }

42
java-numbers-3/src/test/java/com/baeldung/formatNumber/FormatNumberUnitTest.java
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@ -2,6 +2,8 @@ package com.baeldung.formatNumber;
import org.junit.Test; import org.junit.Test;
import java.util.Locale;
import static com.baeldung.formatNumber.FormatNumber.*; import static com.baeldung.formatNumber.FormatNumber.*;
import static org.assertj.core.api.Assertions.*; import static org.assertj.core.api.Assertions.*;
@ -43,4 +45,44 @@ public class FormatNumberUnitTest {
assertThat(withMathRound(F, 2)).isEqualTo(8.7); assertThat(withMathRound(F, 2)).isEqualTo(8.7);
assertThat(withMathRound(F, 3)).isEqualTo(8.699); assertThat(withMathRound(F, 3)).isEqualTo(8.699);
} }
@Test
public void givenIntegerNumber_whenFormatNumber_byPaddingOutZeros_thenGetExpectedResult() {
int value = 1;
assertThat(byPaddingOutZeros(value, 3)).isEqualTo("001");
}
@Test
public void givenIntegerNumber_whenFormatNumber_withTwoDecimalPlaces_thenGetExpectedResult() {
int value = 12;
assertThat(withTwoDecimalPlaces(value)).isEqualTo(12.00);
}
@Test
public void givenIntegerNumber_whenFormatNumber_withLongNumbers_thenGetExpectedResult() {
int value = 123456789;
assertThat(withLongNumbers(value)).isEqualTo("123,456,789");
}
@Test
public void givenDecimalNumber_whenFormatNumber_forPercentages_thenGetExpectedResult() {
double value = 25f / 100f;
assertThat(forPercentages(value, new Locale("en", "US"))).isEqualTo("25%");
assertThat(forPercentages(value, new Locale("pl", "PL"))).isEqualTo("25%");
}
@Test
public void givenCurrency_whenFormatNumber_currencyWithChosenLocalisation_thenGetExpectedResult() {
double value = 23_500;
assertThat(currencyWithChosenLocalisation(value, new Locale("en", "US"))).isEqualTo("$23,500.00");
assertThat(currencyWithChosenLocalisation(value, new Locale("zh", "CN"))).isEqualTo("￥23,500.00");
assertThat(currencyWithChosenLocalisation(value, new Locale("pl", "PL"))).isEqualTo("23 500 zł");
}
@Test
public void givenCurrency_whenFormatNumber_currencyWithDefaultLocalisation_thenGetExpectedResult() {
double value = 23_500;
assertThat(currencyWithDefaultLocalisation(value)).isEqualTo("£23,500.00");
}
} }