从ArrayList转换阵列 [英] From Arraylist to Array

问题描述

我想知道，如果它是安全/建议转换为ArrayList的阵列？
我有每一行的文本文件的字符串：

I want to know if it is safe/advisable to convert from ArrayList to Array? I have a text file with each line a string:

1236
1233
4566
4568
....

我要他们读入数组列表，然后把它转换成数组。难道是可取/法律这样做呢？

I want to read them into array list and then i convert it to Array. Is it advisable/legal to do that?

感谢

推荐答案

是的它是安全的一个的ArrayList 转换为阵列 。无论是一个好主意，取决于你的使用目的。你需要一个<$c$c>ArrayList提供？如果是这样，保持一个的ArrayList 。否则转换了！

Yes it is safe to convert an ArrayList to an Array. Whether it is a good idea depends on your intended use. Do you need the operations that ArrayList provides? If so, keep it an ArrayList. Else convert away!

ArrayList<Integer> foo = new ArrayList<Integer>();
foo.add(1);
foo.add(1);
foo.add(2);
foo.add(3);
foo.add(5);
Integer[] bar = foo.toArray(new Integer[foo.size()]);
System.out.println("bar.length = " + bar.length);

输出

bar.length = 5

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