private BigDecimal weight; public Friend(String name, Integer age, Long height, String city, BigDecimal weight) { this.name = name; this.age = age; this.height = height; this.city = city; this.weight = weight; } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15....
importjava.math.BigDecimal;importjava.util.ArrayList;importjava.util.List;importjava.util.stream.Stream;publicclassMain{publicstaticvoidmain(String[]args){List<BigDecimal>numbers=newArrayList<>();numbers.add(newBigDecimal("10"));numbers.add(newBigDecimal("20"));numbers.add(newBigDecimal("30"));Stre...
Integer sum =sales.stream().mapToInt(Sale::getOrderNum).sum(); Long sum=sales.stream().mapToLong(Sale::getOrderNum).sum(); Double sum=sales.stream().mapToDouble(Sale::getOrderNum).sum(); BigDecimal sum=sales.stream().map(Sale::getAppleSale).reduce(BigDecimal.ZERO, BigDecimal::add)...
示例代码如下: import java.math.BigDecimal; import java.util.List; public class Main { public static void main(String[] args) { List<BigDecimal> list = List.of(BigDecimal.valueOf(1.5), BigDecimal.valueOf(2.5), BigDecimal.valueOf(3.5)); BigDecimal sum = list.stream() .reduce(BigDecimal.ZERO...
BigDecimal total = tOrderOrders.stream() .map(TOrderOrder::getAmount).reduce(BigDecimal.ZERO,BigDecimal::add); list.stream().mapToDouble(User::getHeight).sum()//和 list.stream().mapToDouble(User::getHeight).max()//最大 list.stream().mapToDouble(User::getHeight).min()//最小 ...
// 获得列表对象金额, 使用reduce聚合函数,实现累加器BigDecimal sum = myList.stream() .map(Student::getMoney)...
一、Stream理解 在java中我们称Stream为『流』,我们经常会用流去对集合进行一些流水线的操作。stream就像工厂一样,只需要把集合、命令还有一些参数灌输到流水线中去,就可以加工成得出想要的结果。这样的流水线能大大简洁代码,减少操作。 二、Stream流程 原集合 —> 流 —> 各种操作(过滤、分组、统计) —> 终端操...
1 Sum Bigdecimals inside Stream 2 Sum of list size in sub sub stream 3 Sum multiple BigDecimals to a Map<String, BigDecimal> 2 Summing up BigDecimal in a map of list of objects in Java 6 Why it works: BigDecimal Sum with Reduce and BigDecimal::add 3 Summing BigDecimals in st...
Java Stream流之求和 BigDecimal BigDecimal:BigDecimal bb=list.stream().map(Plan::getAmount).reduce(BigDecimal.ZERO,BigDecimal::add); int、double、long doublemax=list.stream().mapToDouble(User::getHeight).sum();