BigDecimal:
BigDecimal bb =list.stream().map(Plan::getAmount).reduce(BigDecimal.ZERO,BigDecimal::add);
int、double、long:
double max = list.stream().mapToDouble(User::getHeight).sum();
BigDecimal:
BigDecimal bb =list.stream().map(Plan::getAmount).reduce(BigDecimal.ZERO,BigDecimal::add);
int、double、long:
double max = list.stream().mapToDouble(User::getHeight).sum();