How to convert from float to bigDecimal in java?

Question

How to convert from float to bigDecimal in java?

Answer 1

Use the constructor BigDecimal(double value):

float f = 1.5f;
BigDecimal d = new BigDecimal(f);

Answer 2

new BigDecimal(myfloat)

Answer 3

Use contructor:

float f = 10.0f;
BigDecimal b = new BigDecimal(f);

Answer 4

BigDecimal value = new BigDecimal(Float.toString(123.4f));

From the javadocs, the string constructor is generally the preferred way to convert a float into a BigDecimal, as it doesn't suffer from the unpredictability of the BigDecimal(double) constructor.

Quote from the docs:

Note: For values other float and double NaN and ±Infinity, this constructor is compatible with the values returned by Float.toString(float) and Double.toString(double). This is generally the preferred way to convert a float or double into a BigDecimal, as it doesn't suffer from the unpredictability of the BigDecimal(double) constructor.

Answer 5

Converting from float to BigDecimal, in other words: casting? impossible. But you can create an instance of BigDecimal that represents the same fractional value like the float value:

BigDecimal number = new BigDecimal(floatValue);

Answer 6

There are two ways:

First, the recommended way:

float f = 0.2f;
BigDecimal bd = new BigDecimal(f);

but if you print the big decimal it displays 0.20000000298023224, which might not satisfy the needs of your program.

Another way:

float f = 0.2f;
BigDecimal bd = new BigDecimal(String.valueOf(f));

and if you print the big decimal it displays 0.2

Answer 7

For a precision of 3 digits after the decimal point:

BigDecimal value = new BigDecimal(f,
        new MathContext(3, RoundingMode.HALF_EVEN));