understanding super keyword when no extends

Question

public class B {
    B()
    {
        super();
        System.out.println();
    }
    
}

I want to know what is happening in this program it is working fine but there i didnt extended any class

https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html: Class Object is the root of the class hierarchy. **Every class has Object as a superclass.** — OH GOD SPIDERS, Nov 17 '20 at 17:04
every Class by default extended from Object class in Java nd the super() will call the constructor of Object class — Mustafa Poya, Nov 17 '20 at 17:04
Does this answer your question? [super keyword without extends to the super class](https://stackoverflow.com/questions/23441481/super-keyword-without-extends-to-the-super-class) — Marsroverr, Nov 17 '20 at 18:25

score 2 · Answer 1 · answered Nov 17 '20 at 17:03

2

Every class extends Object - so you're invoking that super() method. You can see this if you just set a breakpoint in the constructor and step into the super call. Really what you have is :

public class B extends Object {
    B()
    {
        super();
        System.out.println();
    }
    
}

answered Nov 17 '20 at 17:03

Amir Afghani

37,814
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if we extended a class then that mean it is extending both objct class and the class that we extended is that correct ? correct me if it is wrong thank you – karthik c v Nov 17 '20 at 17:13
It means your class is extending a class that extends Object. – Amir Afghani Nov 17 '20 at 17:14

score 1 · Accepted Answer · answered Nov 17 '20 at 17:05

1

Every Class by default extended from Object class in Java and calling the super() will call the constructor of Object class.

answered Nov 17 '20 at 17:05

Mustafa Poya

2,615
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understanding super keyword when no extends

2 Answers2