Java Singleton

Singleton.java

// 定义单例模式中需要完成的代码逻辑
public interface MySingleton {
  void doSomething();
}

public enum Singleton implements MySingleton {
  INSTANCE {
    @Override
    public void doSomething() {
      System.out.println("complete singleton");
    }
  };

  public static MySingleton getInstance() {
    return Singleton.INSTANCE;
  }
}