Java的:字符串数组的ArrayList中 [英] Java: ArrayList of String Arrays
问题描述
我愿做这样的事情:
private ArrayList<String[]> addresses = new ArrayList<String[3]>();
...这似乎并没有工作。什么存储与每个地址3场阵列中的多个地址,而不为它创建一个单独的类的最简单的方法?
...this does not seem to work. Whats the easiest way of storing multiple addresses with 3 fields per address in an array without creating a separate class for it?
推荐答案
使用第二ArrayList中的3串,不是原始数组。 IE浏览器。结果私人列表&LT;名单,LT;弦乐&GT;&GT;地址=新的ArrayList&LT;名单,LT;弦乐&GT;&GT;();
Use a second ArrayList for the 3 strings, not a primitive array. Ie.
private List<List<String>> addresses = new ArrayList<List<String>>();
然后,你可以有:
ArrayList<String> singleAddress = new ArrayList<String>();
singleAddress.add("17 Fake Street");
singleAddress.add("Phoney town");
singleAddress.add("Makebelieveland");
addresses.add(singleAddress);
(我觉得有些奇怪的事情可以用类型擦除发生在这里,但我不认为它应该在此问题)
(I think some strange things can happen with type erasure here, but I don't think it should matter here)
如果你使用的基本数组死心塌地,只是一个小变化,需要得到您的示例工作。在其他的答案所解释的,该阵列的尺寸不能被包括在声明。因此更改:
If you're dead set on using a primitive array, only a minor change is required to get your example to work. As explained in other answers, the size of the array can not be included in the declaration. So changing:
private ArrayList<String[]> addresses = new ArrayList<String[3]>();
到
private ArrayList<String[]> addresses = new ArrayList<String[]>();
将工作。
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