Converting #39;ArrayListlt;Stringgt; to #39;String[]#39; in Java(转换ArrayListlt;Stringgt;到 Java 中的“字符串 [])

本文介绍了转换'ArrayList<String>到 Java 中的“字符串 []"的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

How might I convert an ArrayList<String> object to a String[] array in Java?

解决方案 

List<String> list = ..;
String[] array = list.toArray(new String[0]);

For example:

List<String> list = new ArrayList<String>();
//add some stuff
list.add("android");
list.add("apple");
String[] stringArray = list.toArray(new String[0]);

The toArray() method without passing any argument returns Object[]. So you have to pass an array as an argument, which will be filled with the data from the list, and returned. You can pass an empty array as well, but you can also pass an array with the desired size.

Important update: Originally the code above used new String[list.size()]. However, this blogpost reveals that due to JVM optimizations, using new String[0] is better now.

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