半小时速通kpi

暑期实习怎么这么难啊#暑期# #java# #实习#

final修饰一个类 ，这个类不可以被继承，修饰方法这个方法不可以被重写，修饰基本数据类型（比如int）值不能发生变更，修饰对象，对象的引用不可以发生变更。我理解的类设置成final，要么这个类是系统运行过程中一个非常重要的类，不希望别人继承。或者这个类的代码已经没有需要改的点了，代码性能足够好代码逻辑足够完整，这个类不需要优化。我也只见过一些JDK或者中间件代码将类设置成final，比如String，我理解String是整个Java运行过程最基础的一个类，如果我可以继承String，那理论上，底层JDK，类方法入参是String的，我继承实现的类也可以传进去然后运行，如果你继承String写...

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