本文介绍了将 3 个数组列表合并为一个的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
限时送ChatGPT账号..我想在 Java 中将 3 个数组列表合并为一个.有谁知道做这种事情的最好方法是什么?
I want to merge down 3 arraylist in one in java. Does anyone know which is the best way to do such a thing?
推荐答案
使用 ArrayList.addAll()
.这样的事情应该可以工作(假设列表包含 String
对象;您应该相应地更改).
Use ArrayList.addAll()
. Something like this should work (assuming lists contain String
objects; you should change accordingly).
List<String> combined = new ArrayList<String>();
combined.addAll(firstArrayList);
combined.addAll(secondArrayList);
combined.addAll(thirdArrayList);
更新
我可以从您的评论中看出您实际上可能正在尝试创建一个 2D 列表.如果是这样,则应使用以下代码:
Update
I can see by your comments that you may actually be trying to create a 2D list. If so, code such as the following should work:
List<List<String>> combined2d = new ArrayList<List<String>>();
combined2d.add(firstArrayList);
combined2d.add(secondArrayList);
combined2d.add(thirdArrayList);
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