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BAEL-6846 - updates due to further discussion about float representation

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This commit is contained in:
mcasari 2023-10-01 21:58:55 +02:00
parent a493c570ad
commit 39c353c6ae
1 changed files with 22 additions and 23 deletions
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45
core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/floattobigdecimal/FloatToBigDecimalUnitTest.java
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@ -16,45 +16,44 @@ class FloatToBigDecimalUnitTest {
}
@Test
public void whenCreatedFromCertainFloatValues_thenMatches() {
float floatToConvert = 0.5f;
BigDecimal bdFromFloat = new BigDecimal(floatToConvert);
assertEquals("0.5", bdFromFloat.toString());
}
@Test
public void whenCreatedFromCertainFloatValues_thenDoesNotMatch() {
public void whenCreatedFromFloat_thenMatchesInternallyStoredValue() {
float floatToConvert = 1.1f;
BigDecimal bdFromFloat = new BigDecimal(floatToConvert);
assertEquals("1.10000002384185791015625", bdFromFloat.toString());
}
@Test
public void whenCreatedFromString_thenMatches() {
String floatValue = Float.toString(1.1f);
BigDecimal bdFromString = new BigDecimal(floatValue);
public void whenCreatedFromString_thenPreservesTheOriginal() {
BigDecimal bdFromString = new BigDecimal("1.1");
assertEquals("1.1", bdFromString.toString());
}
@Test
public void whenCreatedByValueOfAndIsFloat_thenDoesNotMatch() {
float floatToConvert = 1.1f;
BigDecimal bdByValueOf = BigDecimal.valueOf(floatToConvert);
assertEquals("1.100000023841858", bdByValueOf.toString());
public void whenCreatedFromFloatConvertedToString_thenFloatInternalValueGetsTruncated() {
String floatValue = Float.toString(1.1f);
BigDecimal bdFromString = new BigDecimal(floatValue);
assertEquals("1.1", floatValue);
assertEquals("1.1", bdFromString.toString());
}
@Test
public void whenFloatCastToDouble_thenGotADifferentNumber() {
float floatToConvert = 1.1f;
double doubleCast = floatToConvert;
assertEquals("1.100000023841858", Double.toString(doubleCast));
public void whenFloatConvertedToString_thenGetsTruncated() {
String floatValue = Float.toString(1.10000002384185791015625f);
assertEquals("1.1", floatValue);
}
@Test
public void whenCreatedByValueOfAndIsDouble_thenMatches() {
double doubleToConvert = 1.1d;
BigDecimal bdByValueOf = BigDecimal.valueOf(doubleToConvert);
assertEquals("1.1", bdByValueOf.toString());
public void whenCreatedByValueOf_thenFloatValueGetsTruncated() {
assertEquals("1.100000023841858", BigDecimal.valueOf(1.1f)
.toString());
assertEquals("1.100000023841858", BigDecimal.valueOf(1.10000002384185791015625f)
.toString());
}
@Test
public void whenDoubleConvertsFloatToString_thenFloatValueGetsTruncated() {
assertEquals("1.100000023841858", Double.toString(1.1f));
assertEquals("1.100000023841858", Double.toString(1.10000002384185791015625f));
}
}