从 List 中删除特定索引后的所有元素

在 List/ArrayList 中，有没有什么方便的方法可以在特定索引后删除 List 的所有元素。而不是手动循环删除。

为了更好地解释，如果我有一个包含10个元素的列表，我想提到索引3，然后索引3之后的所有元素都被删除，我的列表现在只包含4个开始的元素(从0开始计数)

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最佳答案

list.subList(4, list.size()).clear();

Sublist operations are reflected in the original list, so this clears everything from index 4 inclusive to list.size() exclusive, a.k.a. everything after index 3. Range removal is specifically used as an example in the documentation:

This method eliminates the need for explicit range operations (of the sort that commonly exist for arrays). Any operation that expects a list can be used as a range operation by passing a subList view instead of a whole list. For example, the following idiom removes a range of elements from a list:
     list.subList(from, to).clear();

public class Count { public static void main(String[] args) { ArrayList<String> arrayList = new ArrayList<String>(); arrayList.add("1"); arrayList.add("2"); arrayList.add("3"); arrayList.add("4"); arrayList.add("5"); arrayList.subList(2, arrayList.size()).clear(); System.out.println(arrayList.size()); } }