我怎样写这将在两个列表和数组的工作方法？ [英] How do I write a method which would work on both lists and arrays?

问题描述

我有一个看起来像这样的方法：

I have a method which looks like this:

void foo (List<String> list, ...) {
  ...
  for (String s : list) { // this is the only place where `list` is used
    ...
  }
  ...
}

如果我更换了完全相同的code将工作列表与LT;弦乐＆GT;列表与的String []列表，但是，以避免意大利面条code，我把单一的方法，当我需要调用它阵列上 A ，我这样做是这样的：美孚（Arrays.asList（A））。

the exact same code would work if I replace List<String> list with String[] list, however, to avoid spaghetti code, I keep the single method, and when I need to call it on an array a, I do it like this: foo(Arrays.asList(a)).

我不知道这是正确的方式。

I wonder if this is The Right Way.

即，

• 什么是开销 Arrays.asList（）？


• 有没有写这将接受两个数组和列表，一种方法一种方法，就像为循环呢？

• What is the overhead of Arrays.asList()?
• Is there a way to write a method which would accept both arrays and lists, just like the for loop does?

谢谢！

推荐答案

Arrays.asList（）有一个小的开销。还有就是要实现两个方法之一没有真正的方法列表和阵列。

Arrays.asList() has a small overhead. There is no real way to implement one method for both List and arrays.

但你可以做到以下几点：

But you can do the following:

void foo (List<String> list, ...) {
  ...
  for (String s : list) { // this is the only place where *list* is used
    ...
  }
  ...
}

void foo (String[] arr, ...) {
  if ( arr != null ) {
      foo(Arrays.asList(arr),...);
  }
}

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