Write a Java program (non-GUI preferred) to demonstrate the Singleton pattern.The key parts of the singleton pattern are:A private static variable to store the single instance called the singletonA public static method for callers to get a reference to the instanceA private constructor so no callers can instantiate the object directlyUsing these key parts, write a Java program that will allow a user of the program to assign only one runner to each of the 8 lanes of running track in a field.Include a brief documentation (in the code or in a separate document) to explain the input (if any), processing and output of the program