使用Java流创建具有动态值的员工列表

问题描述

我有一个用例，其中我必须创建ID递增的默认雇员列表，

I have use case where I have to create List of default employees with incrementing id,

List<Employee> employeeList = new ArrayList<>();
int count = 0;
while (count++ <= 100){
    Employee employee = new Employee(count, "a"+count);
    employeeList.add(employee);
}

我没有可以使用流的任何收藏.我们可以通过功能方式做到吗?

I don't have any collection on which I could use stream. Can we do it in functional way?

推荐答案

您可以使用 IntStream 与rangeClosed(int startInclusive, int endInclusive)一起生成计数

You can use IntStream with rangeClosed(int startInclusive, int endInclusive) to generate the count

List<Employee> employeeList = IntStream.rangeClosed(0,100)
                                       .boxed()
                                       .map(count-> new Employee(count, "a"+count))
                                       .collect(Collectors.toList());

或者您可以使用 Stream.iterate

List<Employee> employeeList = Stream.iterate(0, n -> n + 1)
                                    .limit(100)
                                    .map(i -> new Employee(i, "a" + i))
                                    .collect(Collectors.toList())

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