为什么构造函数不能在java中继承？ [英] Why constructors can not be inherited in java?

问题描述

我是java编程语言的初学者，最近我研究过构造函数不能在java中继承，任何人都可以解释为什么？ b
$ b

我已阅读 C ++的链接

解决方案

简单来说，构造函数不能被继承，因为在子类中有不同的名称（子类的名称）。

  class A {
 A ）; 
} 
 
 B类扩展A {
 B（）; 
} 
  

您只能执行：

  B b = new B（）; //而不是新的A（）
  

可以使用。

由于原因：
继承一个构造函数没有太大意义，因为A类的构造函数意味着创建一个类型的对象A，B类的构造函数意味着创建B类的对象。

你仍然可以使用

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

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?

I have already read this link of C++

解决方案

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();
}

You can do only:

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

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

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.

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

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

这篇关于为什么构造函数不能在java中继承？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！