用于整数的 Java ArrayList [英] Java ArrayList for integers

问题描述

我想将一些值添加到 ArrayList 中以跟踪显示的数字.这些值是整数，所以我创建了一个 ArrayList;

I have values that I'd like to add into an ArrayList to keep track of what numbers have shown up. The values are integers so I created an ArrayList;

ArrayList<Integer[]> list = new ArrayList<>();
int x = 5
list.add(x);

但我无法使用此方法向 ArrayList 添加任何内容.如果我对数组列表使用字符串，它会起作用.我是否必须将其设为 String 数组，然后以某种方式将数组转换为整数?

But I'm unable to add anything to the ArrayList using this method. It works if I use Strings for the array list. Would I have to make it a String array and then somehow convert the array to integers?

我还有一个问题.我希望列表只包含 3 个值.我该怎么做?

I have another question. I'd like the list to only hold 3 values. How would I do so?

推荐答案

Integer 列表.

List<Integer> list = new ArrayList<>();
int x = 5;
list.add(x);

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