Java 将 ArrayList 转换为 String[][]

Question

我是否必须循环遍历每个元素才能转换ArrayList<String[]>至String[][]或者有更有效的方法吗？

Answer 1

只需以数组形式获取内容

List<String[]> list = new ArrayList<>();
...
String[][] array = list.toArray(new String[0][0]); // the size here is not important, the array is just an indication of the type to use