转换列表< String> Java中的String [] [英] Converting List<String> to String[] in Java

问题描述

如何将列表转换为数组？以下代码返回错误。

How do I convert a list into an array? The following code returns an error.

public static void main(String[] args) {
    List<String> strlist = new ArrayList<String>();
    strlist.add("sdfs1");
    strlist.add("sdfs2");
    String[] strarray = (String[]) strlist.toArray();       
    System.out.println(strarray);
}

错误：

Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String;
    at test.main(test.java:10)

推荐答案

你想要

String[] strarray = strlist.toArray(new String[0]);

参见这里的文档，并注意您也可以调用此方法，以填充传递的方法数组，而不是仅使用它来计算返回的类型。另请注意，也许当您打印阵列时，您更喜欢

See here for the documentation and note that you can also call this method in such a way that it populates the passed array, rather than just using it to work out what type to return. Also note that maybe when you print your array you'd prefer

System.out.println(Arrays.toString(strarray));

因为这将打印实际元素。

since that will print the actual elements.

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