Data
BigDecimal class
The BigDecimal class
java.math.BigDecimal
- The BigDecimal class provides a way to perform accurate decimal calculations in Java. It also provides a way to store numbers with more than 16 significant digits.
- You can pass a BigDecimal object to the format method of a NumberFormat object, but NumberFormat objects limit the results to 16 significant digits.
Constructors of the BigDecimal class
| Constructor | Description |
|---|---|
| BigDecimal(int) | Creates a new BigDecimal object with the specified int value. |
| BigDecimal(double) | Creates a new BigDecimal object with the specified double value. |
| BigDecimal(long) | Creates a new BigDecimal object with the specified long value. |
| BigDecimal(String) | Creates a new BigDecimal object with the specified String object. |
Methods of the BigDecimal class
| Methods | Description |
|---|---|
| add(value) | Returns the value of this BigDecimal object after the specified BigDecimal value has been added to it. |
| compareTo(value) | Compares the value of the BigDecimal object with the value of the specified BigDecimal object and returns -1 if less, 0 if equal, and 1 if greater. |
| divide(value, scale, rounding-mode) | Returns the value of this BigDecimal object divided by the value of the specified BigDecimal object, sets the specified scale, and uses the specified rounding mode. |
| multiply(value) | Returns the value of this BigDecimal object multiplied by the specified BigDecimal value. |
| setScale(scale, rounding-mode) | Sets the scale and rounding mode for the BigDecimal object. |
| subtract(value) | Returns the value of this BigDecimal object after the specified BigDecimal value has been subtracted from it. |
| toString() | Converts the BigDecimal value to a string. |
The RoundingMode enumeration
java.math.RoundingMode
Two of the values in the RoundingMode enumeration
| Values | Description |
|---|---|
| HALF_UP | Round towards the "nearest neighbor" unless both neighbors are equidistant, in which case round up. |
| HALF_EVEN | Round towards the "nearest neighbor" unless both neighbors are equidistant, in which case round toward the even neighbor. |
The import statement that's required for BigDecimal arithmetic
import java.math.*; // imports all classes and enumerations in java.math
How to create a BigDecimal object from another BigDecimal object
BigDecimal total2 = new BigDecimal(total.toString());