Q)What is a singleton class?
A)In simple words,  A
singleton class is a class which can have only one instance at any point of
time throughout the application and provides a global point of access to its
instance.
Q)Ok, How can you create a singleton class?
A)
class Singleton {
       public static final Singleton INSTANCE = new Singleton();
       private Singleton() {
       }
}
                 This is a simple example for a singleton class where I used
a public static final INSTANCE variable and