将字符数组列表转换为字符串? [英] Converting ArrayList of Characters to a String?

问题描述

Java中如何将ArrayList转换为String?

How to convert an ArrayList<Character> to a String in Java?

List.toString 方法将其返回为 [a,b,c] 字符串 - 我想去掉括号(等)并将其存储为 <代码>abc.

The List.toString method returns it as [a,b,c] string - I want to get rid of the brackets (etcetera) and store it as abc.

推荐答案

您可以遍历列表并创建字符串.

You can iterate through the list and create the string.

String getStringRepresentation(ArrayList<Character> list)
{    
    StringBuilder builder = new StringBuilder(list.size());
    for(Character ch: list)
    {
        builder.append(ch);
    }
    return builder.toString();
}

将 StringBuilder 的容量设置为列表大小是一个重要的优化.如果不这样做，某些 append 调用可能会触发构建器的内部大小调整.

Setting the capacity of the StringBuilder to the list size is an important optimization. If you don't do this, some of the append calls may trigger an internal resize of the builder.

顺便说一句，toString() 返回 ArrayList 内容的人类可读格式.花时间从中过滤掉不必要的字符是不值得的.它的实现明天可能会发生变化，您将不得不重写过滤代码.

As an aside, toString() returns a human-readable format of the ArrayList's contents. It is not worth the time to filter out the unnecessary characters from it. It's implementation could change tomorrow, and you will have to rewrite your filtering code.

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