final Long numberOfUsers = fromLaunchToSpecifiedMonthgetcompanyEnumValue; final Integer totalUserNumber = comMapgetcompanyEnumValue; numberOfUserstotalUserNumber使用百分比保留两位小数 使用Bi

import java.math.BigDecimal;

final Long numberOfUsers = fromLaunchToSpecifiedMonth.get(companyEnumValue); final Integer totalUserNumber = comMap.get(companyEnumValue);

BigDecimal percentage = BigDecimal.valueOf((double)numberOfUsers / totalUserNumber * 100); percentage = percentage.setScale(2, BigDecimal.ROUND_HALF_UP);

System.out.println(percentage + "%");