An object of an immutable sequence type cannot change once it is created. (If the object contains references to other objects, these other objects may be mutable and may be changed; however, the collection of objects directly referenced by an immutable ob
An object of an immutable sequence type cannot change once it is created. (If the object contains references to other objects, these other objects may be mutable and may be changed; however, the collection of objects directly referenced by an immutable ob
一个不可变对象一旦建立其值不可能再改变(如果这个对象包括其它对象的引用,这个被引用的对象可以是可变对象并且其值可以变化;但为该不可变对象所直接引用的对象集合是不能变的.