please follow the instruction of 4a to 4b and write this in java thank you

13) (20 points) Complete the following Sale and SaleDemo classes. 4.a) Sales class. It has a field, 10 -element array that holds the sales for 10 stores. The program has three methods: a) a constructor that accepts an array parameter. b) a method that returns the maximum sales for the stores. c) a method that returns the total sales for the stores. // Sales Program public class Sales 1 4.1) (3 points) declare a private 10 -element array named sales that holds the sales for 10 stores. } (*4.2) (3 points) define a constructor that accepts an array parameter and use it to initialize the field sales. / 144.3) (3 points) write a method named maxSales. It has no parameters, and returns the maximum sales among the 10 stores. *4.4) (3 points) write a method named totalSales. It has no parameters, and returns the total sales among the 10 stores. % 4.b) Complete the following main program which demonstrates how to use the class. II SalesDeme Program \{ public static void main(String] args) \{ IDefine any variables you need * 4.4) (2 points) define a 10-element array which contains the sales for 10 stores, and initialize them to be {16500,21234,17000,35100,26231,36098,39784, II 26300,29500,43100};/ object*)(4.5)(3noints) create an object of Sales, storeSales, and pass the above array to the /44.6) ( 3 points) call the method maxSales to get the maximum sales and print out the result */ J//end of main method