If you are creating a mutable class m, you should be prepared to write a lot more documentation about the treatment of references to m than if m were immutable.
如果您要创建一个可变类m，那么您应该准备编写比m是不可变的情况下多得多的文档说明，以说明怎样处理m的引用。
Inner classes can refer to mutable instance fields if the inner-class expression occurs in an instance context, but this is not the same thing.
如果内部类表达式出现在某个实例上下文中的话，内部类可以引用可变的实例域instance field，但这不是同一回事。
The class that is shown in the previous example is mutable.
前面示例中所示的类是可变的。
If the value being assigned is a mutable value class, the method returns a shallow copy of the class, because value classes have copy semantics.
如果分配的值是可变值类，则该方法返回该类的浅表副本，因为值类拥有复制语义。
If the value being assigned is a mutable value class, the method returns a shallow copy of the class, because value classes have copy semantics.
如果分配的值是可变值类，则该方法返回该类的浅表副本，因为值类拥有复制语义。
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