import java.util.*;

/** N&auml;iteobjekt, mis sisaldab <code> int </code> t&uuml;&uuml;pi 
 * v&auml;lja. Isendid on v&otilde;rreldavad suuruse j&auml;rgi.
 * @author Jaanus P&ouml;ial
 * @since 1.5
 */
public class Arv implements Comparable<Arv> {

   /** Isendimuutuja. */
   private int sisu = 0;

   /** Konstruktor uue objekti loomiseks. */
   Arv (int i) {
      sisu = i;
   }

   /** Teine konstruktor, mis loob objekti stringist. */
   Arv (String s) {
      sisu = Arv.parseArv (s);
   }

   /** Avalik meetod andmete lugemiseks objektist. */
   public int arvValue() {
      return sisu;
   }

   /** Objekti esitus stringina. */
   @Override
   public String toString() {
      return String.valueOf (this.arvValue());
   }

   /** Kas kaks objekti on sisu poolest v&otilde;rdsed. */
   @Override
   public boolean equals (Object o) {
      int osisu = ((Arv)o).arvValue();
      return this.arvValue() == osisu;
   }

   /** Liidese Comparable kohustuslik meetod. */
   public int compareTo (Arv o) {
      int osisu = ((Arv)o).arvValue();
      if (this.arvValue() == osisu)
         return 0;
      else
         if (this.arvValue() > osisu)
            return 1;
         else
            return -1;
   }

   /** Koopia tegemine. */
   @Override
   public Object clone() {
      return new Arv (arvValue());
   }

   /** Vabrik. */
   public static Arv valueOf (int i) {
      return new Arv (i);
   }

   /** Teine vabrik stringist loomiseks. */
   public static Arv valueOf (String s) {
      return new Arv (s);
   }

   /** Teisendus stringist arvuks. */
   public static int parseArv (String s) {
      return Integer.parseInt (s);
   }

   /** Kahe arvu liitmine. */
   public Arv pluss (Arv a) {
      return new Arv (this.arvValue() + a.arvValue());
   }
   // teised tehted tehakse analoogiliselt liitmisega

   /** Peameetod. Rakenduse kohustuslik meetod. */
   public static void main (String[] args) {
      if (args.length > 0) {
         int i = Arv.parseArv (args[0]);
         System.out.println (args[0]);
         System.out.println (Arv.valueOf (i).toString());
         System.out.println (Arv.valueOf (args[0]).toString());
      }
      Arv a1 = new Arv (2);
      Arv a2 = Arv.valueOf (-1);
      Arv a3 = (Arv)a2.clone();
      System.out.println ("Peab olema true:");
      System.out.println (a2.equals (a3));
      System.out.println (a2 != a3);
      System.out.println (a2.compareTo (a3) == 0);
      System.out.println (a2.equals (a2));
      System.out.println (a2 == a2);
      System.out.println (a2.compareTo (a2) == 0);
      System.out.println (a1.compareTo (a2) > 0);
      System.out.println (a2.compareTo (a1) < 0);
      System.out.println (!a1.equals (a2));
      System.out.print (a1 + " + " + a2 + " = ");
      System.out.println (a1.pluss (a2));
      ArrayList<Arv> l = new ArrayList<Arv>();
      for (int i = 0; i < 10; i++) {
         l.add (new Arv ((int)(Math.random()*100.)));
      }
      System.out.println (l);
      Collections.sort (l);
      System.out.println (l);
   }

}