title: What is the best solution for Singleton Pattern?
body: <p>If using INSTANCE holder class to implement Singleton Pattern, the compiler will generate another class file named classname$1.class. You can find the question by this link: <a href="https://stackoverflow.com/questions/17006585/why-does-classname1-class-generate-in-this-situation">here</a>
  . So my question is what is the solution for Singleton Pattern? double check?</p>