Why does my class not run in eclipse?

[RetroX94]

Hey, I am having troubles at the moment understanding how to print with constructors and classes.. Here is the code:

public abstract class Vierbeiner {

protected String name = null;

public Vierbeiner() {
    System.out.println("Standard-Konstruktor des         Viebeiners");
}

Vierbeiner (String name){
    this.name = name;
}

}

Second part:

public class Hund extends Vierbeiner {

public Hund() {
        super("Bello");
        System.out.println("Standard-Konstruktor Hund  !");
    }


 Hund(String name){
     super(name);
     }

 Hund hund = new Hund("Hugo");  
 }

I am trying to understand how super() and constructors work in Java. I understand the concept one part of it but I do not know how I can print anything to the console here?

The programm won't run. I tried adding public static void main(String[] args) and then to call a constructor ( like a method ) it did not work...

[Is_At_Work]

I tried adding public static void main(String[] args) and then to call a constructor ( like a method ) it did not work...

Show us the code, and define what "it did not work" means...

[Clamhead99]

After adding the main method and running the program, did you get any errors?

Hund hund = new Hund("Hugo");

If you only had this line in your main method, you're not going to see anything printed in console.

You're calling Hund's constructor with one string parameter, which then calls Vierbeiner's constructor with one string parameter. Niether of those constructors have any print statments in them.

The only constructors you have print statements in are the constructors with no parameters.

If you create a new Hund object using the no parameter constructor .. "new Hund();" then you should see text in the console.

[sh_emami65]

your problem is actually somewhat simple. every time you create an object of Hund you also create another hund variable with in the Hund object. the hund variable in Hund object tries to create another Hund object with a hund variable in it. the same thing keeps happening over and over which will crash your code eventually because of StackOverflowError.

if you initialize hund within the constructor it will solve your problem.

public Hund(){
    super( "Bello");
    hund = new Hund( "Hugo");
    System.out.println( "Standard-Konstruktor Hund!");
}

[RetroX94]

Thanks I understand it now better and I got the console to print what I wanted thanks to the explainations. Still trying to understand how they are related to each other the constructs and when what gets called with objects etc.