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 public class Singleton {
   // Private constructor prevents instantiation from other classes
   private Singleton() {}
    * SingletonHolder is loaded on the first execution of Singleton.getInstance() 
    * or the first access to SingletonHolder.INSTANCE, not before.
   private static class SingletonHolder { 
     private static final Singleton INSTANCE = new Singleton();
   public static Singleton getInstance() {
     return SingletonHolder.INSTANCE;

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