Write a java program which defines unconstrained array of user defined length n (the value of n is to be taken from a proper user’s input). fill in the array with n random numbers. the application should (1) display all elements of the array, (2) display the sum of all elements, and (3) calculate the average of all elements.
random numbers need to be generated inside the program making use of the prebuilt java random numbers generator available in the math library class.

Part d: float check string has a method s.isdigit() that returns true if string s contains only digits and false otherwise, i.e. s is a string that represents an integer. write a function named float_check that takes one parameter that is a string and returns true if the string represents a float and false otherwise. for the purpose of this function we define a float to be a string of digits that has at most one decimal point. note that under this definition an integer argument will return true. remember “edge cases” such as “45.” or “.45”; both should return true. for example: float_check('1234') returns true float_check('123.45') returns true float_check('123.45.67') returns false float_check('34e46') returns false float_check('.45') returns true float_check('45.') returns true float_check('45..') returns false