为什么在Java中不继承构造函数? [英] Why are constructors not inherited in java?

问题描述

我是Java编程语言的初学者，最近我研究了构造函数不能在Java中继承，有人可以解释为什么吗?

I am a beginner in java programming language, recently I have studied that constructors can not be inherited in java, Can anyone please explain why?

我已经阅读了 C ++的此链接

推荐答案

简单来说，构造函数无法继承，因为在子类中，构造函数具有不同的名称(子类的名称).

In simple words, a constructor cannot be inherited, since in subclasses it has a different name (the name of the subclass).

class A {
   A();
}

class B extends A{
   B();
}

您只能执行以下操作:

B b = new B();  // and not new A()

方法是使用相同名称"继承的，可以使用.

Methods, instead, are inherited with "the same name" and can be used.

原因: 继承构造函数没有多大意义，因为类A的构造函数意味着创建一个A类型的对象，而类B的构造函数意味着创建一个B类的对象.

As for the reason: It would not have much sense to inherit a constructor, since constructor of class A means creating an object of type A, and constructor of class B means creating an object of class B.

尽管如此，您仍然可以在B的实现中使用 A中的构造函数:

You can still use constructors from A inside B's implementation though:

class B extends A{
   B() { super(); }
}

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