OOP: inheritance with extends

Question

Can anybody tell me why this code isn't correct?

public class Boss extends Angestellter {

    Boss(String v, String n, int a) { // ERROR **
        vorname = großKleinSchreibung(v); 
        nachname = großKleinSchreibung(n);
        alter = a;

    }
}

** Implicit super constructor Angestellter() is undefined. Must explicitly invoke another constructor

public class Angestellter {

    protected String vorname;
    protected String nachname;
    public int alter;

    Angestellter(String v, String n, int a) {

        this.vorname = großKleinSchreibung(v);
        this.nachname = großKleinSchreibung(n);
        this.alter = a;

    }

I dont find the error, because its exactly how its explained in the book which im using to learn oop with java.

Angestrellter doesn't have non-parametric constructor. So you must call super(String v, String n, int a) in your constructor Boss — Zlopez
– Zlopez, Commented Mar 18, 2015 at 11:01

Eran · Accepted Answer · 2015-03-18 11:00:18Z

4

You should call the constructor of the base class explicitly, since if you don't, the compiler adds an implicit call to the parameterless constructor of the base class, which doesn't exist in your case.

public class Boss extends Angestellter {
    Boss(String v, String n, int a) { 
        super (v,n,a);
        vorname = großKleinSchreibung(v); 
        nachname = großKleinSchreibung(n);
        alter = a;
    }
}

answered Mar 18, 2015 at 11:00

Eran

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1 Comment

CallMeBronxy Over a year ago

Fine, thanks... but that's not mentioned in the book -.-

Junaid S. · Accepted Answer · 2015-03-18 11:23:35Z

0

In simple words

You cannot override constructor of super class in JAVA

Here is your little modified code !!

public class Angestellter {

    protected String vorname;
    protected String nachname;
    public int alter;

    Angestellter(String v, String n, int a) {

        this.vorname = großKleinSchreibung(v);
        this.nachname = großKleinSchreibung(n);
        this.alter = a;

    }
...
}

public class Boss extends Angestellter {

    ... Other methods
}

// In main 

Angestellter myObj = new Boss("asd","as",1); // It will call constructor itself ... because it is inherited !!

answered Mar 18, 2015 at 11:23

Junaid S.

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