流处理

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流处理的主要接口和类主要分为以上三个

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package All.D14.Steam_;
import java.util.ArrayList;
import java.util.List;

public class Employee { // 员工类
private String name; // 姓名
private int age; // 年龄
private double salary; // 工资
private String sex; // 性别
private String dept; // 部门

// 构造方法
public Employee(String name, int age, double salary, String sex, String dept) {
    this.name = name;
    this.age = age;
    this.salary = salary;
    this.sex = sex;
    this.dept = dept;
}

// 重写此方法，方便打印输出员工信息
public String toString() {
    return "name=" + name + ", age=" + age + ", salary=" + salary + ", sex=" + sex + ", dept=" + dept;
}

// 以下是员工属性的getter方法
public String getName() {
    return name;
}

public int getAge() {
    return age;
}

public double getSalary() {
    return salary;
}

public String getSex() {
    return sex;
}

public String getDept() {
    return dept;
}

public static List<Employee> getEmpList() { // 提供数据初始化方法
    List<Employee> list = new ArrayList<Employee>();
    // 添加员工数据
    list.add(new Employee("老张", 40, 9000, "男", "运营部"));
    list.add(new Employee("小刘", 24, 5000, "女", "开发部"));
    list.add(new Employee("大刚", 32, 7500, "男", "销售部"));
    list.add(new Employee("翠花", 28, 5500, "女", "销售部"));
    list.add(new Employee("小马", 21, 3000, "男", "开发部"));
    list.add(new Employee("老王", 35, 6000, "女", "人事部"));
    list.add(new Employee("小王", 21, 3000, "女", "人事部"));
    return list;
}

}

package All.D14;
import All.D14.Steam_.Employee;

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

class Demon01 {
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
// 将年龄大于30岁的员工过滤出来
stream = stream.filter(people -> people.getAge() > 30);
// 将流对象重新封装成一个List集合
List<Employee> result = stream.collect(Collectors.toList());
for (Employee emp : result) { // 遍历结果集
System.out.println(emp); // 输出员工对象信息
}
}
}

name=老张, age=40, salary=9000.0, sex=男, dept=运营部
name=大刚, age=32, salary=7500.0, sex=男, dept=销售部
name=老王, age=35, salary=6000.0, sex=女, dept=人事部