如何从超类继承构造函数到子类 [英] how to inherit Constructor from super class to sub class

问题描述

如何从超类继承构造函数到子类?

How to inherit the constructor from a super class to a sub class?

推荐答案

构造函数不是继承的，您必须在子类中创建一个新的、原型相同的构造函数，映射到超类中的匹配构造函数.

Constructors are not inherited, you must create a new, identically prototyped constructor in the subclass that maps to its matching constructor in the superclass.

以下是其工作原理的示例:

Here is an example of how this works:

class Foo {
    Foo(String str) { }
}

class Bar extends Foo {
    Bar(String str) {
        // Here I am explicitly calling the superclass 
        // constructor - since constructors are not inherited
        // you must chain them like this.
        super(str);
    }
}

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