How to Format Floats with Decimal Precision in Java?

Formatting Floats with Decimal Precision

Formatting floating-point numbers to a specific number of decimal places is a common task in various programming scenarios. To achieve this, one widely used approach is to utilize the BigDecimal class in Java. However, if the expected return type is a float, using BigDecimal might yield incorrect results.

In the given code example:

<code class="java">public static float Redondear(float pNumero, int pCantidadDecimales) {
    // the function is call with the values Redondear(625.3f, 2)
    BigDecimal value = new BigDecimal(pNumero);
    value = value.setScale(pCantidadDecimales, RoundingMode.HALF_EVEN); // here the value is correct (625.30)
    return value.floatValue(); // but here the values is 625.3
}</code>

The issue arises while converting the BigDecimal value back to a float. For this purpose, it is recommended to use the String.format method as follows:

String.format("%.2f", floatValue);

By specifying the desired number of decimal places within the format specifier (%.2f), you can obtain a formatted string representation of the float value with the specified precision. Note that the return type is a String in this case.

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