round up java_java – BigDecimal.ROUND_HALF_UP和RoundingMode.HALF_UP之间的区别？

下面：

new MathContext(precision, RoundingMode.HALF_UP);

似乎工作.但是,以下内容返回错误：

new MathContext(precision, BigDecimal.ROUND_HALF_UP);

错误：

java: no suitable constructor found for MathContext(int,int)

constructor java.math.MathContext.MathContext(java.lang.String) is not applicable

(actual and formal argument lists differ in length)

constructor java.math.MathContext.MathContext(int,java.math.RoundingMode) is not applicable

(actual argument int cannot be converted to java.math.RoundingMode by method invocation conversion)

constructor java.math.MathContext.MathContext(int) is not applicable

(actual and formal argument lists differ in length)

最佳答案 请注意常量：

RoundingMode.HALF_UP

BigDecimal.ROUND_HALF_UP

根据Javadocs并根据源代码表示绝对相同：

public enum RoundingMode {

....

HALF_UP(BigDecimal.ROUND_HALF_UP),

....

}