Need some help with this JAVA problem

Write a method called changeVolume so that you can modify how loud a sound produced by a WAV file is. The method takes a floating point argument called scale and scales(multiplies) all the samples in a given WAV file up or down by this value. Test your program with different values of scale. Method should have following format: public void changeVolume(String source, String dest, float scale). *java.io must be imported.