Need help with the following JAVA problem:

Create a public class called AudioEcho. Add a method called createEcho to the AudioEcho class. The createEcho method should read a WAV audio file and then create an echo effect when the file is played by adding the current sample rate byte at index i to a previous sample rate byte at index i - n. In the main method call createEcho method and test the program using the following 3 values for n (500, 1000, and 1500).