对于-each和指针在Java中 [英] For-Each and Pointers in Java

问题描述

好了，所以我tyring通过一个ArrayList迭代并删除specefic元素。不过，我使用的for-each状结构遇到了一些麻烦。当我运行下面的code：

Ok, so I'm tyring to iterate through an ArrayList and remove a specefic element. However, I am having some trouble using the For-Each like structure. When I run the following code:

ArrayList<String> arr = new ArrayList<String>();
//... fill with some values (doesn't really matter)

for(String t : arr)
{
  t = " some other value "; //hoping this would change the actual array
}

for(String t : arr)
{
  System.out.println(t); //however, I still get the same array here
}

我的问题中，如何才能让'T'指针'改编'，所以，我能够改变的值在for-each循环？我知道我可以通过循环使用不同的结构ArrayList中，但是这一次看起来如此干净和可读性，这纯粹是很好能够做出T的指针。

My question in, how can I make 't' a pointer to 'arr' so that I am able to change the values in a for-each loop? I know I could loop through the ArrayList using a different structure, but this one looks so clean and readable, it would just be nice to be able to make 't' a pointer.

所有评论都是AP preciated！即使你说我应该只吸起来，并使用不同的结构。

All comments are appreciated! Even if you say I should just suck it up and use a different construct.

推荐答案

我认为最好的办法可能是使用一个for循环。

I think the best approach may be to use a for loop.

    ArrayList<String> arr = new ArrayList<String>();

    for (int i = 0; i < arr.size(); i++) {

        String t = arr.get(i);

        if (// your condition is met) {
            arr.set(i, "your new value");
        }
    }

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