一次将多个项目添加到 Java 中的 ArrayList
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Adding multiple items at once to ArrayList in Java
提问by Lealo
How can I add multiple items at once to an ArrayList?
ArrayList<Integer> integerArrayList = new ArrayList();Instead of:
integerArrayList.add(1)integerArrayList.add(2)integerArrayList.add(3)integerArrayList.add(4)...
如何一次向 ArrayList 添加多个项目？
ArrayList<Integer> integerArrayList = new ArrayList();而不是：
integerArrayList.add(1)integerArrayList.add(2)integerArrayList.add(3)integerArrayList.add(4)...
I would like to: integerArrayList.add(3, 1, 4, 2);So that I wont have to type so much. Is there a better way to do this?
我想：integerArrayList.add(3, 1, 4, 2);这样我就不用打那么多字了。有一个更好的方法吗？
采纳答案by Zircon
回答by kar
Is your List fixed? If yes the following should work.
你的清单是固定的吗？如果是，以下应该有效。
List<Integer> integerArrayList = Arrays.asList(1, 2, 3);
回答by Jacob G.
If the Listwon't need to be added/removed to/from after it's initialized, then use the following:
如果在List初始化后不需要添加/删除它，则使用以下命令：
List<Integer> integerArrayList = Arrays.asList(1, 2, 3, 4);
Otherwise, you should use the following:
否则，您应该使用以下内容：
List<Integer> integerArrayList = new ArrayList<>(Arrays.asList(1, 2, 3, 4));
回答by Teto
Would something like this work for you.
像这样的东西对你有用吗？
Integer[] array = {1,2,3,4};
ArrayList<Integer> list = new ArrayList<>(Arrays.asList(array));
Or you could use a loop to fill the list.
或者您可以使用循环来填充列表。
int i;
for(i = 0; i < 1000; i++){
list.add(i);
}
