Amazon.java

/*
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 */
package amazon;

/**
 *
 * @author Marlon
 */
public class Amazon {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
       
        Kunde Hans = new Kunde();
        Bestellung bestellung1 = new Bestellung();
        Posten posten1 = new Posten();
        Artikel artikel1 = new Artikel();
        
        Hans.name = "Hans";
        posten1.menge = 10;
        artikel1.name = "Duschgel";
        
        Hans.bestellung = bestellung1;
        bestellung1.posten = posten1;
        posten1.artikel = artikel1;
    }
    
}

Artikel.java

/*
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package amazon;

/**
 *
 * @author Marlon
 */
public class Artikel {
    
    String name;
}

Bestellung.java

/*
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package amazon;

/**
 *
 * @author Marlon
 */
public class Bestellung {
    Posten posten;
}

Posten.java

/*
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 */
package amazon;

/**
 *
 * @author Marlon
 */
public class Posten {
    
    Artikel artikel;
    int menge;
}