# How to Convert BigDecimal to Float or Float to BigDecimal in java with examples

## #BigDecimal in Java

`BigDecimal` is a class that represents arbitrary-precision signed decimal numbers. It comprises a 32-bit integer and an unscaled decimal value. This class is defined in the `java.math` package and finds applications in scenarios such as product prices and scientific calculations.

On the other hand, `Float` is utilized for storing 32-bit floating-point numbers.

This tutorial will guide you on how to convert a `BigDecimal` to a `Float` in Java.

Important Note: When dealing with currency values, if you use `BigDecimal` and decide to convert to `Float`, precision is lost. This can lead to inaccurate results, especially in currency processing. It is advisable to exercise caution in such scenarios.

You can also check my previous posts on the `BigInteger` class in java.

## #How to Convert BigDecimal to Float in Java

The `BigDecimal` class in Java provides a method named `floatValue` for converting BigDecimal to a float value. Depending on the magnitude of the BigDecimal value, it returns either Float.`NEGATIVE_INFINITY` or `Float.POSITIVE_INFINITY`.

The syntax for the floatValue method is as follows.

Here is a syntax

``````    public float floatValue()
``````

Here’s an example program demonstrating the conversion.

``````import java.math.BigDecimal;

public class BigDecimalTest {
public static void main(String[] args) {
BigDecimal order = new BigDecimal(789.124);
System.out.println(order); // 789.124000000000023646862246096134185791015625
System.out.println(order.getClass()); // class java.math.BigDecimal
Float floatValue = order.floatValue();
System.out.println(floatValue); // 789.124
System.out.println(floatValue.getClass()); // class java.lang.Float
}
}
``````

Output:

``````789.124000000000023646862246096134185791015625
class java.math.BigDecimal
789.124
class java.lang.Float
``````

## #How to Convert Float to BigDecimal in Java

This section explains two ways to convert a Float to BigDecimal in Java.

• Using BigDecimal Constructor

With the constructor, you can convert either a `String` or `double` parameter. Convert the `Float` into a `string` and return a `BigDecimal` object. Since a `float` is automatically converted to double, you can pass double parameters to the constructor.

``````public BigDecimal(String val)
public BigDecimal(Double val)

``````
• Using valueOf method The static `valueOf` method takes the Float value and returns a BigDecimal object.

``````    public static BigDecimal valueOf(double val)
``````

Here is a complete program code

``````import java.math.BigDecimal;

public class BigDecimalTest {
public static void main(String[] args) {

Float f = 467.123f;
System.out.println(f); //467.123
System.out.println(f.getClass()); //class java.lang.Float

// using String constructor
BigDecimal order = new BigDecimal(f.toString());
System.out.println(order); //467.123
System.out.println(order.getClass()); //class java.lang.BigDecimal

// using double constructor
BigDecimal order1 = new BigDecimal(f);
System.out.println(order1); //467.12298583984375
System.out.println(order1.getClass()); //class java.lang.BigDecimal

// using valueOf method
BigDecimal order2 = BigDecimal.valueOf(f);
System.out.println(order2); //467.12298583984375
System.out.println(order2.getClass()); //class java.lang.BigDecimal

}
}
``````

Output:

``````467.123
class java.lang.Float
467.123
class java.math.BigDecimal
467.12298583984375
class java.math.BigDecimal
467.12298583984375
class java.math.BigDecimal
``````

In the program, `precision` is a long value. You can restrict precision or decimal values using the MathContext object and specifying the desired precision.

Here’s an example code to convert float to BigDecimal with 3 decimal places:

Following are steps

• Create a BigDecimal object
• Pass `Double` value,`MathContext` object to constructor
``````      public BigDecimal(double val, MathContext mc)
``````
• Using `MathContext` class It takes a precision value which is of total digits before and after dot (.)operator and pass `RoundingMode.HALF_EVEN`

Here is an example code to convert float to bigdecimal with 3 decimal places.

``````import java.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;

public class BigDecimalTest {
public static void main(String[] args) {

Float f = 467.123f;
System.out.println(f); //467.123
System.out.println(f.getClass()); //class java.lang.Float

// using MathContext method to limit 2 decimal places
BigDecimal order = new BigDecimal(f.floatValue(),
new MathContext(6, RoundingMode.HALF_EVEN));
System.out.println(order); //467.123
System.out.println(order.getClass()); //class java.lang.BigDecimal

}
}
``````

## #Summary

In summary, we’ve learned multiple ways to convert `BigDecimal` to or from `Float` in Java. It’s crucial to be cautious when converting `BigDecimal` to `Float` to avoid precision loss, especially in currency calculations.