bigdecimal.round_up

BigDecimal.round_up是一个Java中的BigDecimal类的方法，用于将BigDecimal对象的值向上舍入到指定的小数位数。如果舍入后的值与原始值相等，则不进行舍入。该方法返回一个新的BigDecimal对象，其值为舍入后的值。

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BigDecimal.ROUND_UP

BigDecimal.ROUND_UP is a rounding mode constant in the BigDecimal class in Java. It specifies that a BigDecimal value should be rounded up to the nearest value that is greater than or equal to the original value.

For example, if we have a BigDecimal value of 3.14159 and we round it up using the BigDecimal.ROUND_UP constant with a scale of 2 (meaning we want to round to 2 decimal places), the result would be 3.15.

This rounding mode is often used for financial calculations to ensure that decimal values are always rounded up to the next penny or cent, depending on the currency being used.

bigdecimal.Round_UP

The `BigDecimal` class in Java provides a method `setScale(int newScale, RoundingMode roundingMode)` that can be used to round a `BigDecimal` value to a specified number of decimal places with a specified rounding mode.

To round up a `BigDecimal` value, you can use the `RoundingMode.UP` constant as the `roundingMode` parameter. This rounding mode rounds towards positive infinity, so any value with a non-zero fractional part will be rounded up to the next highest value.

Here's an example:

import java.math.BigDecimal;
import java.math.RoundingMode;

public class Example {
    public static void main(String[] args) {
        BigDecimal value = new BigDecimal("3.14159");
        BigDecimal roundedValue = value.setScale(2, RoundingMode.UP);
        System.out.println(roundedValue); // output: 3.15
    }
}

In this example, the `value` `BigDecimal` is rounded up to 2 decimal places using the `RoundingMode.UP` constant as the rounding mode. The resulting `roundedValue` `BigDecimal` is then printed to the console.