Haus.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Haus {
    
    Moebel lieblingsmoebel;
    String name;
}

Kontinent.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Kontinent {
    
    Land lieblingsland;
    String name;
}

Land.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Land {
    
    Region lieblingsregion;
    String name;
}

Matroschka.java

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package matroschka;

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

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        
        Universum Milchi = new Universum();
        Milchi.name = "Milchi";
        Planet Erde = new Planet();
        Erde.name = "Erde";
        Kontinent Europa = new Kontinent();
        Europa.name = "Europa";
        Land Deutschland = new Land();
        Deutschland.name = "Deutschland";
        Region Saarland = new Region();  
        Saarland.name = "Saarland";
        Stadt Voelklingen = new Stadt();
        Voelklingen.name = "Voelklingen";
        Strasse Merkurstrasse = new Strasse();
        Merkurstrasse.name = "Merkurstrasse";
        Haus hausneunzehn = new Haus();
        hausneunzehn.name = "neunzehn";
        Moebel dievonikea = new Moebel();
        dievonikea.name = "dievonikea";
        Tisch tisch1 = new Tisch();
        tisch1.name = "tisch1";
        
        
        Milchi.lieblingsplanet = Erde;
        Erde.lieblingskontinent = Europa;
        Europa.lieblingsland = Deutschland;
        Deutschland.lieblingsregion = Saarland;
        Saarland.lieblingsstadt = Voelklingen;
        Voelklingen.lieblingsstrasse = Merkurstrasse;
        Merkurstrasse.lieblingshaus = hausneunzehn;
        hausneunzehn.lieblingsmoebel = dievonikea;
        dievonikea.lieblingstisch = tisch1;
        
       
    }
    
}

Moebel.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Moebel {
    
    Tisch lieblingstisch;
    String name;
}

Planet.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Planet {
    
  
    String name;
      Kontinent lieblingskontinent;
}

Region.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Region {
    
    Stadt lieblingsstadt;
    String name;
}

Stadt.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Stadt {
    
    Strasse lieblingsstrasse;
    String name;
}

Strasse.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Strasse {
    
    Haus lieblingshaus;
    String name;
}

Tisch.java

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package matroschka;

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

Universum.java

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package matroschka;

/**
 *
 * @author Marlon
 */
public class Universum {
  
    
    String name;
    Planet lieblingsplanet;
}