1 RoundingMode介绍
package java.math;public enum RoundingMode {UP(BigDecimal.ROUND_UP),DOWN(BigDecimal.ROUND_DOWN),CEILING(BigDecimal.ROUND_CEILING),FLOOR(BigDecimal.ROUND_FLOOR),HALF_UP(BigDecimal.ROUND_HALF_UP),HALF_DOWN(BigDecimal.ROUND_HALF_DOWN),HALF…