[英]Create an int[] from an ArrayList<Integer>
Is there an easy way of creating an int[]
or the equivalent Integer[]
from an ArrayList<Integer>
? 有没有一种简单的方法可以从
ArrayList<Integer>
创建int[]
或等效的Integer[]
?
When I try (Integer[])list.getArray()
, I get this stack trace: 当我尝试
(Integer[])list.getArray()
,我得到了这个堆栈跟踪:
Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object;
线程“主”中的异常java.lang.ClassCastException:[Ljava.lang.Object; cannot be cast to [Ljava.lang.Integer;
无法转换为[Ljava.lang.Integer;
The only other way I can think of is: 我能想到的唯一其他方法是:
int[] array = new int[list.size()];
for (int i = 0; i < array.size; i++){
array[i] = list.get(i);
//or I could do list.remove(0), is there any difference?
}
return array;
but that way seems terribly slow. 但是那样看来似乎很慢。
yourIntList.toArray(new Integer[yourIntList.size()]);
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