转换原始多头阵列成多头列表 [英] Convert an array of primitive longs into a List of Longs

问题描述

这可能是一个有点简单，headdesk这类问题的，但我第一次尝试令人惊讶的完全未能奏效。我想采取原始多头的数组，并把它变成一个列表，我试图这样做：

This may be a bit of an easy, headdesk sort of question, but my first attempt surprisingly completely failed to work. I wanted to take an array of primitive longs and turn it into a list, which I attempted to do like this:

long[] input = someAPI.getSomeLongs();
List<Long> inputAsList = Arrays.asList(input); //Total failure to even compile!

什么是做到这一点的正确方法？

What's the right way to do this?

推荐答案

我发现它方便使用Apache郎ArrayUtils做（<一个href=\"http://commons.apache.org/proper/commons-lang/javadocs/api-3.1/org/apache/commons/lang3/ArrayUtils.html#toObject(long[])\">JavaDoc)

I found it convenient to do using apache commons lang ArrayUtils (JavaDoc)

long[] input = someAPI.getSomeLongs();
Long[] inputBoxed = ArrayUtils.toObject(input);
List<Long> inputAsList = Arrays.asList(inputBoxed);

它也有反向的API

it also has the reverse API

long[] backToPrimitive = ArrayUtils.toPrimitive(objectArray);

编辑：更新，以提供完整的信号转换到列表中的意见和其他修复的建议

updated to provide a complete conversion to a list as suggested by comments and other fixes.

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