什么时候首选`StringBuilder`而不是将`String`附加到`String`?
以下是添加 String 的两种方法:
Below are two ways how to append String:
String firstString = "text_0";
String secondString = "text_1";
String resultString = firstString + secondString;
StringBuilder sb = new StringBuilder();
sb.append(firstString).append(secondString);
String resultString = sb.toString();
我的问题是 - 什么时候使用 StringBuilder 更有效?假设有 10 个字符串，我需要创建其中一个.
My question is - when is more effective to use StringBuilder? Let's say there are 10 strings, and I need to create one of them.
推荐答案
因为 StringBuilder 可以追加"一个字符串，而不是每次创建新对象时连接两个字符串.即使您将 += 运算符与字符串一起使用，也会创建一个新对象.仅当您尝试连接大量字符串时，此优势才会变得相关.If 也被认为更具可读性.
Because StringBuilder can "append" a string instead of concatenating two strings each time creating a new object. Even if you use += operator with Strings a new object is created. This advantage will only become relevant once you try to concatenate a great number of strings. If is also consiedered a bit more readable.
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