2021-12-04

import java.util.List;
import java.util.stream.Stream;

public class AllMatchDemo {
public static void main(String[] args) {
List<Employee> list = Employee.getEmpList(); // 获取公共类的测试数据
Stream<Employee> stream = list.stream(); // 获取集合流对象
// 判断所有员工的年龄是否都大于25
boolean result = stream.allMatch(people -> people.getAge() > 25);
System.out.println("所有员工是否都大于25岁：" + result); // 输出结果
}
}

====import java.util.List;
import java.util.stream.DoubleStream;
import java.util.stream.Stream;
public class MapToInDemo {
public static void main(String[] args) {
List<Employee> list = Employee.getEmpList(); // 获取公共类的测试数据
Stream<Employee> stream = list.stream(); // 获取集合流对象
// 将所有开发部的员工过滤出来
stream = stream.filter(people -> "销售部".equals(people.getDept()));
// 将所有员工的名字映射成一个新的流对象
DoubleStream salarys = stream.mapToDouble(Employee::getSalary);
// 统计流中元素的数学总和
double sum = salarys.sum();
System.out.println("销售部一个月的薪资总额："+sum);
}
}