![]() The Walker School – Games and Simulations - 2010 A list within another list is said to be nested. (a list of ints) (a list of strings) Lists and strings-and other things that behave like ordered sets-are called sequences. The values that make up a list are called its elements. Lists A list is an ordered set of values, where each value is identified by an index. White-Key Arrays 2D array (list) used for white keys 2D array (list) used for white key notes The Walker School – Games and Simulations - 2010 Elements in the array can be accessed using an index (the number inside the brackets).Sometimes lists are used, rather than arrays. It can hold many variables and thus can store many values. Data structures that hold information.This is because the are created with a loop and then placed in different positions. One Big Problem The problem here is that all of our keys now play middle “g” sound. One Possible Solution Greenfoot refers to the center point of an object, so the first key is placed at x-coordinates 0 and half the key is off the board. What is it and what’s the solution? The Walker School – Games and Simulations - 2010 One Possible Solution You only have to change the x variable in the coordinates, as all of the keys need to be the same distance from the top. What do you need to do to make sure that the keys are not on top of each other? You will need to figure out how to move each key to a different location on the x access.If you don’t do it the variable will not change. Most common error is to forget to increment the loop counter. For example: while (condition) Also, Local variables are declared inside the function and have no visibility modifier (private or public).Place the key exactly to the left of the first key. Write code to create a second piano key that plays a middle-g (sound file 3g.wav), when the “f” key is pressed. ![]() Step #3 – Construct Piano Places a key at the top of the keyboard. One Possible Solution The Walker School – Games and Simulations - 2010 ![]() Programming Challenge What needs to be added in our play() method to pass a sound from the constructor to the play method which activates a key? The Walker School – Games and Simulations - 2010 How many parameters can a constructor take? Values that are passed from one function to another get assigned to variables called parameters. ![]() Some functions can take more than one argument. The Walker School – Games and Simulations - 2010Īrguments and Parameters Arguments are values that control how the function does its job. Step #2 - Assignment Add parameters to the constructor, so that bits of information can be passed in when the object is constructed. Create a variable to hold the sound file. Step #1 - Create Instance Variables Create a variable to hold the name of the key. Thus, we avoid repeating many lines of code.In the case of the piano, we are creating a general Key class that will act the same with each key, i.e. A concept or idea not associated with any specific instance.Producing the Sound Calls the play method. The Walker School – Games and Simulations - 2010Ĭhecking if a Key is Down Variable that stores “true” while the piano key is down, and “false” while it isn’t. The Walker School – Games and Simulations - 2010Īnimating Keys Key Constructor Key Method The Walker School – Games and Simulations - 2010Īnimated White Key Switches between two images: white-key and white-key down. Java Key Words Keywords are words which have a predefined meaning in the language because of this, programmers cannot use keywords as names for variables, methods, classes, or as any other identifier. Piano World What are the Java keywords in this class? Piano Class Method that specifies the size and resolution of the world Piano Constructor Piano Games and Simulations O-O Programming in Java The Walker School The Walker School – Games and Simulations - 2010
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