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。
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。
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