如何动态地向String数组添加元素? [英] How to dynamically add elements to String array?

问题描述

我想从 for 循环内部向字符串数组添加动态数量的元素.

I want to add dynamic number of elements to a string array from inside a for loop.

如何创建一个未定义长度的字符串数组?

How to create an string array of an undefined length?

推荐答案

Arrays 在 Java 中有一个定义的大小，你以后不能通过添加或删除元素来改变它(你可以阅读一些基础知识此处).

Arrays in Java have a defined size, you cannot change it later by adding or removing elements (you can read some basics here).

相反，使用 List:

Instead, use a List:

ArrayList<String> mylist = new ArrayList<String>();
mylist.add(mystring); //this adds an element to the list.

当然，如果您事先知道要在数组中放入多少个字符串，则可以创建该大小的数组并使用正确的位置设置元素:

Of course, if you know beforehand how many strings you are going to put in your array, you can create an array of that size and set the elements by using the correct position:

String[] myarray = new String[numberofstrings];
myarray[23] = string24; //this sets the 24'th (first index is 0) element to string24.

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