试图在java中查找Arraylist中出现的所有对象 [英] Trying to find all occurrences of an object in Arraylist, in java

问题描述

我在Java中有一个ArrayList，我需要在其中找到所有出现的特定对象。
方法ArrayList.indexOf（Object）只找到一个匹配项，所以我似乎需要别的东西。

I have an ArrayList in Java, and I need to find all occurrences of a specific object in it. The method ArrayList.indexOf(Object) just finds one occurrence, so it seems that I need something else.

推荐答案

我认为你不需要过于花哨。以下应该可以正常工作：

I don't think you need to be too fancy about it. The following should work fine:

static ArrayList<Integer> indexOfAll(Object obj, ArrayList list){
    ArrayList<Integer> indexList = new ArrayList<Integer>();
    for (int i = 0; i < list.size(); i++)
        if(obj.equals(list.get(i)))
            indexList.add(i);
    return indexList;
}

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