在 Java 的子类中使用父构造函数 [英] Using parent constructor in a child class in Java

问题描述

我有一个类ChildClass"，它扩展了ParentClass"类.与其完全替换父类的构造函数，我想先调用父类的构造函数，然后再做一些额外的工作.

I have a class "ChildClass" that extends the class "ParentClass". Rather than completely replace the constructor for the parent class, I want to call the parent class's constructor first, and then do some extra work.

我相信默认情况下会调用父类的 0 参数构造函数.这不是我想要的.我需要使用参数调用构造函数.这可能吗?

I believe that by default the parent class's 0 arguments constructor is called. This isn't what I want. I need the constructor to be called with an argument. Is this possible?

我试过了

this = (ChildClass) (new  ParentClass(someArgument));

但这不起作用，因为您无法修改this".

but that doesn't work because you can't modify "this".

推荐答案

您可以在子级的构造函数中使用super"引用父级的构造函数.

You can reference the parent's constructor with "super", from within a child's constructor.

public class Child extends Parent {
    public Child(int someArg) {
        super(someArg);
        // other stuff
    }
    // ....
}

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