* key and a sound file, which is played when the key is pressed. * This method makes the below keys when compile is hit or the program opens.ĪddObject (new Key ('g', '3a.wav'), i*63 + 54, 140) * A piano that can be played with the computer keyboard. Import greenfoot.* // (World, Actor, GreenfootImage, and Greenfoot) // (World, Actor, GreenfootImage, and Greenfoot) / A key on a piano keyboard. Here is an index of all the JOC videos in order: Joy of Code announcement. Here is the code example from the piano class: The Joy of Code video series gives a thorough introduction to Greenfoot and the basics of Java programming. I am confused in general how the program knows that the keys are set from left to right in the first place. The remaining keys should be next to each other, with no space between them.' Rewrite it (in this document only-not in your working Greenfoot program) to create the keys from right to left, instead of left to right, and force the rightmost key to be flush against the right side of the screen. With this information in mind, copy the new loop code you entered to correctly place the keys in the space below.

Recall that the piano is 800 pixels wide. 'According to the text, Greenfoot refers to objects by the midpoint of their lengths and widths. What is the name of each method defined in the Piano class (dont include return values or parameters). I am working on exercise 5.18 (not the same as the book example) and it says: Greenfoot checks to see if the left or right cursor key. I am working on my assignment for school and this question has thrown me for a loop, no pun intended, this chapter is about loops and arrays.

Greenfoot piano key class code