package patterns;

 public class AmericaPresident {

     private static AmericaPresident aAmericaPresident;

     private AmericaPresident(){}

     public static AmericaPresident getAmericaPresidentInstance(){

         if(aAmericaPresident == null)

             aAmericaPresident = new AmericaPresident();

         return aAmericaPresident;

     }

     public static void testAmericanPresidentInstance(){

         System.out.println(aAmericaPresident.hashCode());

     }

     public static void main(String[] args){

         AmericaPresident americaPresident_1 = AmericaPresident.getAmericaPresidentInstance();

         americaPresident_1.testAmericanPresidentInstance();

         AmericaPresident americaPresident_2 = AmericaPresident.getAmericaPresidentInstance();

         americaPresident_2.testAmericanPresidentInstance();

     }

 }