然而,在有些时候,人们希望超类中的某些方法允许被子类访问,或允许子类的方法访问超类的某个域。为此,需要将这些方法或域声明为protected。例如,如果将超类Employee中的hireDay声明为proteced,而不是私有的,Manager中的方法就可以直接地访问它
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大家都知道,最好将类中的域标记为private,而方法标记为public。任何声明为private的内容对其他类都是不可见的。前面已经看到,这对于子类来说也完全适用,即子类也不能访问超类的私有域。
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如果多个方法(比如,StringBuilder构造器方法)有相同的名字、不同的参数,便产生了重载。编译器必须挑选出具体执行哪个方法,它通过用各个方法给出的参数类型与特定方法调用所使用的值类型进行匹配来挑选出相应的方法。如果编译器找不到匹配的参数,就会产生编译时错误,因为根本不存在匹配,或者没有一个比其他的更好。(这个...