for example suppose that we have the classes A, B, C, D, E
现在,A有公开的静态变量
我希望这一变量只出现在A和B级,而不是C、D、E。
如果不使变数得到保护和利用遗产,这样做是可能的吗?
自行安排A和B类课程,使外地违约情况(包装)可见度。 (Don t given a public,protected or private/code> specifier.
你们必须有一个固定的跳板。 在这种避风港之外,你可以作出例外规定,赶走,检查打电话,然后准许进入或拒绝进入。
Other than that, the answer lies in inheritance and other well-known OO solutions.
不可能。 如果B级只有A级,你可以使用内层。
你们可以做的是,把A和B放在单独的一揽子计划中,使一揽子计划的成员只看到变数。 要做到这一点,你就不得不放弃可见的关键词(如公开或保护)。 Java变量的缺省可见度是一揽子方案。
a 枪支和枪支是公开和静态的,但只能从A类和B类(和AB)获得。
......
public class AB
{
private static class A
{
public static int aVar ;
}
private static class B
{
public static int bVar ;
}
}
......
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