如何有效地为List的所有元素添加前缀? [英] How to add prefix to all the elements of List efficiently?

问题描述

我有一个列表，我需要在列表的所有元素中添加一个前缀.

I have a List in which I need to add a prefix in all the elements of my list.

下面是通过迭代列表然后添加列表的方式.还有其他更好的方法吗?能做同样事情的任何一两个班轮吗?

Below is the way I am doing it by iterating the list and then adding it. Is there any other better way to do it? Any one-two liner that can do the same stuff?

private static final List<DataType> DATA_TYPE = getTypes();

public static LinkedList<String> getData(TypeFlow flow) {
    LinkedList<String> paths = new LinkedList<String>();
    for (DataType current : DATA_TYPE) {
        paths.add(flow.value() + current.value());
    }
    return paths;
}

我需要返回LinkedList，因为我正在使用LinkedList类的某些方法，例如 removeFirst .

I need to return LinkedList since I am using some methods of LinkedList class like removeFirst.

到目前为止，我使用的是Java 7.

I am on Java 7 as of now.

推荐答案

对于一个内衬，请使用Java 8 Streams:

For one liners, use Java 8 Streams :

List<String> paths = DATA_TYPE.stream().map(c -> flow.value() + c.value()).collect(Collectors.toList());

如果必须生成 LinkedList ，则应使用其他收集器.

If you must produce a LinkedList, you should use a different Collector.

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