C＃密封vs Java决赛 [英] C# sealed vs Java final

问题描述

有人请告诉我以下使用密封的原因是不能编译的？然而，如果我用 final 替换 sealed 并将其编译为Java，它就可以工作。

Would anybody please tell me as the reason the following use of sealed does not compile? Whereas, if I replace sealed with final and compile it as Java, it works.

private sealed int compInt = 100;
public bool check(int someInt)
{
    if (someInt > compInt)
    {
        return true;
    }
    return false;
}

推荐答案

那是因为<$ c $ Java中的c> final 意味着很多不同的东西，具体取决于你在哪里使用它而C＃中的密封仅适用于 类和潜在的虚拟成员（方法，属性，事件）。

That's because final in Java means plenty of different things depending on where you use it whereas sealed in C# applies only to classes and potentially virtual members (methods, properties, events).

在Java final 可以应用于：

In Java final can be applied to:

• 类，这意味着该类无法继承。这相当于C＃的密封。


• 方法，这意味着无法覆盖该方法派生类。这是C＃中的默认值，除非您将方法声明为 virtual ，并且在派生类中，对于密封的其他派生类，可以防止这种情况再次。


• 字段和变量，这意味着它们只能初始化一次。对于字段，C＃中的等价物是 readonly 。

• classes, which means that the class cannot be inherited. This is the equivalent of C#'s sealed.
• methods, which means that the method cannot be overridden in a derived class. This is the default in C#, unless you declare a method as virtual and in a derived class this can be prevented for further derived classes with sealed again.
• fields and variables, which means that they can only be initialized once. For fields the equivalent in C# is readonly.

这篇关于C＃密封vs Java决赛的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！