在java中将ArrayList添加到另一个ArrayList [英] Add ArrayList to another ArrayList in java
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问题描述
我有以下 java 代码,其中我试图将 ArrayList 复制到另一个 ArrayList.
I am having the following java code, in which I am trying to copy the ArrayList to another ArrayList.
ArrayList<String> nodes = new ArrayList<String>();
ArrayList NodeList = new ArrayList();
ArrayList list = new ArrayList();
for (int i = 0; i < PropertyNode.getLength() - 1; i++) {
Node childNode = PropertyNode.item(i);
NodeList Children = childNode.getChildNodes();
if (Children != null) {
nodes.clear();
nodes.add("PropertyStart");
nodes.add(Children.item(3).getTextContent());
nodes.add(Children.item(7).getTextContent());
nodes.add(Children.item(9).getTextContent());
nodes.add(Children.item(11).getTextContent());
nodes.add(Children.item(13).getTextContent());
nodes.add("PropertyEnd");
}
NodeList.addAll(nodes);
list.add(NodeList);
}
我想要列表"数组采用这种格式:
I want the "list" array to be in this format:
[[PropertyStart,a,b,c,PropertyEnd],[PropertyStart,d,e,f,PropertyEnd],[PropertyStart,......]]
但是从上面的代码来看,list"数组输出如下所示:
But from the above code, the "list" array output is seen like this:
[PropertyStart,a,b,c,PropertyEnd,PropertyStart,d,e,f,PropertyEnd,PropertyStart,....PropertyEnd]
我想您可能已经注意到了差异.我无法以预期的格式获得结果.
I think you might have noticed the difference. I am not able to achieve the result in expected format.
推荐答案
那么你需要一个ArrayLists
的ArrayList
:
ArrayList<ArrayList<String>> nodes = new ArrayList<ArrayList<String>>();
ArrayList<String> nodeList = new ArrayList<String>();
nodes.add(nodeList);
请注意,NodeList
已更改为 nodeList
.在 Java 命名约定 中,变量以小写开头.类以大写开头.
Note that NodeList
has been changed to nodeList
. In Java Naming Conventions variables start with a lower case. Classes start with an upper case.
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