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@ -996,7 +996,7 @@ public final class String implements java.io.Serializable, Comparable<String>, C
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> 相关阅读：[如何理解 String 类型值的不可变？ - 知乎提问](https://www.zhihu.com/question/20618891/answer/114125846)
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> 补充（来自[issue 675](https://github.com/Snailclimb/JavaGuide/issues/675)）：在 Java 9 之后，String 、`StringBuilder` 与 `StringBuffer` 的实现改用 byte 数组存储字符串 `private final byte[] value`
> 补充（来自[issue 675](https://github.com/Snailclimb/JavaGuide/issues/675)）：在 Java 9 之后，`String` 、`StringBuilder` 与 `StringBuffer` 的实现改用 byte 数组存储字符串。
`StringBuilder` 与 `StringBuffer` 都继承自 `AbstractStringBuilder` 类，在 `AbstractStringBuilder` 中也是使用字符数组保存字符串，不过没有使用 `final` 和 `private` 关键字修饰，最关键的是这个 `AbstractStringBuilder` 类还提供了很多修改字符串的方法比如 `append` 方法。