JAVA A Matryoshka, or Russian nesting doll is either solid or hollow. If it is hollow, it contains another doll (which can also be hollow or solid). Given the supplied Doll class, implement a recursive method named show that returns a String representing the chain for dolls, for example Natasha contains Tanya contains Peter public class Doll { private String name; private Doll dollInside; /** * Constructs a hollow doll with the doll it contains. */ public Doll(String theName, Doll theDoll) { name = theName; dollInside = theDoll; } /** * Constucts a solid doll. */ public Doll(String theName) { name = theName; dollInside = null; } public boolean isSolid() { return dollInside == null; } public String getName() { return name; } public Doll getDollInside() { return dollInside; } } public class DollViewer { public static String show(Doll d) { /* code goes here */ } public static void main (String [] args) { Doll dolls1 = new Doll("Alina", new Doll("Vera", new Doll("Galina"))); Doll dolls2 = new Doll("Anna", new Doll("Dina")); Doll dolls3 = new Doll("Nika"); Doll dolls4 = new Doll("Martina", new Doll("Olga", new Doll("Sofia", new Doll("Elvira")))); System.out.println(show(dolls1)); System.out.println(show(dolls2)); System.out.println(show(dolls3)); System.out.println(show(dolls4)); } }

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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JAVA 

Matryoshka, or Russian nesting doll is either solid or hollow. If it is hollow, it contains another doll (which can also be hollow or solid). Given the supplied Doll class, implement a recursive method named show that returns a String representing the chain for dolls, for example

Natasha contains Tanya contains Peter

public class Doll
{
   private String name;
   private Doll dollInside;

   /**
    * Constructs a hollow doll with the doll it contains.
    */
   public Doll(String theName, Doll theDoll)
   {
      name = theName;
      dollInside = theDoll;
   }

   /**
    * Constucts a solid doll.
    */
   public Doll(String theName) { name = theName; dollInside = null; }

   public boolean isSolid()  { return dollInside == null; }
   public String getName()   { return name; }
   public Doll getDollInside() { return dollInside; }
}

public class DollViewer
{
   public static String show(Doll d)
   {

      /*  code goes here */

   }

   public static void main (String [] args)
   {
      Doll dolls1 = new Doll("Alina", new Doll("Vera", new Doll("Galina")));
      Doll dolls2 = new Doll("Anna", new Doll("Dina"));
      Doll dolls3 = new Doll("Nika");
      Doll dolls4 = new Doll("Martina", new Doll("Olga", new Doll("Sofia", new Doll("Elvira"))));
      System.out.println(show(dolls1));
      System.out.println(show(dolls2));
      System.out.println(show(dolls3));
      System.out.println(show(dolls4));
   }
}   

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