Homework 4, assigned OCT. 27 due NOV. 3 at 11:59pm

4. Write a program in which the main method calls a method with the heading public static char changeCase(char ch) that if ch is a lowercase letter, the method will return the corresponding uppercase letter, and if ch is a uppercase letter, the method will return the corresponding lowercase letter. If ch is not a letter, the method returns the same value of ch. Thus, for instance, changeCase('a') returns A, changeCase('B') returns b, and changeCase('3') returns 3. Note that the uppercase letters have a unicode (ascii code) value that is 32 lower than the corresponding lowercase ones.

Your main method should contain three calls to changeCase() for each case mentioned above.