04-jdk8 终止操作

ゝ一纸荒年。 2023-10-11 14:59 10阅读 0赞

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3hhY2NwSjJFRQ_size_16_color_FFFFFF_t_70][]

public class Demo8 {
        public static void main(String[] args) {
            ArrayList<Employee> lst=new ArrayList<>();
            lst.add(new Employee("小王",1000));
            lst.add(new Employee("小张",11000));
            lst.add(new Employee("小刘",11000));
            lst.add(new Employee("小孙",14000));
            lst.add(new Employee("小李",25000));
            //终止操作 foreach
            lst.stream().filter(e->e.getSalary()>10000)
                    .forEach(System.out::println);
    
            //终止操作 min 、max count
            System.out.println("-------------min----------------------");
            Optional<Employee> min = lst.stream().min((e1, e2) -> Integer.compare(e1.getSalary(), e2.getSalary()));
            System.out.println(min.get());
    
            System.out.println("-------------max----------------------");
            Optional<Employee> max = lst.stream().max((e1, e2) -> Integer.compare(e1.getSalary(), e2.getSalary()));
            System.out.println(max.get());
    
            System.out.println("------------count-----------------------");
            long count = lst.stream().count();
            System.out.println(count);
    
            //终止操作 reduce 规约
            //计算所有员工的工资和
            System.out.println("---------reduce 规约--------------------------");
            Optional<Integer> sum = lst.stream().map(e -> e.getSalary()).reduce((x, y) -> x + y);
            System.out.println(sum.get());
    
            //终止操作 collect收集
            //获取所有的员工姓名，封装成一个list集合
            System.out.println("--------------collect收集---------------------");
            List<String> collect = lst.stream().map(e -> e.getName()).collect(Collectors.toList());
            System.out.println(collect);
    
    
        }
    }

代码执行结果为

Employee{salary=11000, name='小张'}
    Employee{salary=11000, name='小刘'}
    Employee{salary=14000, name='小孙'}
    Employee{salary=25000, name='小李'}
    -------------min----------------------
    Employee{salary=1000, name='小王'}
    -------------max----------------------
    Employee{salary=25000, name='小李'}
    ------------count-----------------------
    5
    ---------reduce 规约--------------------------
    62000
    --------------collect收集---------------------
    [小王, 小张, 小刘, 小孙, 小李]

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