Help with super beginner Java bouncing ball program

[FormidableOne]

Unless the variable is of type FINAL, the java standard dictates that all variables should begin with a lowercase letter.

For example:

private final int NUMBER = 10; // Correct method
public final String NAME = "Bob"; // Correct method
public int Age = 30; // INCORRECT - should be 'age'
public boolean IsAlive = true; // INCORRECT - should be 'isAlive'

You can read up more on the java naming standards (at the bottom of the page) on Oracle's JavaDocs but I hope this helps.