The instances of this class are immutable.
该类的实例是不可变的。
Like its global cousin, a class constant is immutable once defined.
与全局属性一样，类常量一旦定义就不可更改。
If the String class is immutable, you should never see any output from this program.
如果string类是不变的，则从此程序应当看不到任何输出。
There are some class immutable is impossible, then try to limit the mutability of them.
而总有些类显然不可能是不变类的，这时也要尽可能的限制它的可变性。
There are some class immutable is impossible, then try to limit the mutability of them.
而总有些类显然不可能是不变类的，这时也要尽可能的限制它的可变性。
应用推荐