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+3-1Lines changed: 3 additions & 1 deletion

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Original file line number	Diff line number	Diff line change
`@@ -1008,9 +1008,11 @@ public class Student {`
`1008`	`1008`
`1009`	`1009`	`#### 2.5.1. String StringBuffer 和 StringBuilder 的区别是什么? String 为什么是不可变的?`
`1010`	`1010`
	`1011`	`+可变性`
	`1012`	`+`
`1011`	`1013`	简单的来说：`String` 类中使用 final 关键字修饰字符数组来保存字符串，`private final char value[]`，所以`String` 对象是不可变的。
`1012`	`1014`
`1013`		-> 补充（来自[issue 675](https://github.com/Snailclimb/JavaGuide/issues/675)）：在 Java 9 之后，String 类的实现改用 byte 数组存储字符串 `private final byte[] value`;
	`1015`	+> 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`
`1014`	`1016`
`1015`	`1017`	而 `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`char[]value` 但是没有用 `final` 关键字修饰，所以这两种对象都是可变的。
`1016`	`1018`

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