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POAdding random arrays to random arrays in java to make it equal another array
 

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  1. POAdding random arrays to random arrays in java to make it equal another array
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    <p>I am learning java, and from what I can tell, what I am looking to do is a rare situation.</p> <p>I am trying to use an API (kindof) to randomly generate musical notes. I want it to generate 20 times so i have it in a for loop. I realize that i could have used a list for this I just dont know how I could have implemented it. The question I have is, when I try to compile this code, the first part runs. It lets me make the seed. However after that it gives me</p> <pre><code>Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 at co.kbcomp.music.Main.main(Main.java:64) </code></pre> <p>What could I do to prevent this? I know that what I am doing is wrong. That much I dont need to be told. What I want to know is where am I going wrong.</p> <pre><code>package co.kbcomp.music; import java.util.*; import org.jfugue.*; import java.util.Scanner; public class Main { public static void main(String[] args){ Scanner in = new Scanner(System.in); System.out.println("Please enter a number for the seed of the song"); long seed = in.nextLong(); Calendar cal = Calendar.getInstance(); Random rand; //rand = new Random(cal.getTime()); rand = new Random(seed); int NoteNumber = 0; int NoteLength = 0; int OctiveNumber = 0; int ChordNumber = 0; int InversionNumber = 0; //int Duration = rand.nextInt(100 - 5) + 5; //This keeps track of the iteration of the for loop. String[] NN = { " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "}; String[] NL = { " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "}; String[] IN = { " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "}; String[] CN = { " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "}; String[] ON = { " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " ", " "}; //This is what is being played String[] note = { "A", "B", "C", "D", "E", "F", "G" }; String[] noteLength = {"", "w", "", "h", "", "q","", "i"}; String[] octive = { "","1","", "2", "", "3", "", "4", "", "5", "", "6", "", "7", "", "8", "", "9"}; String[] chord = { "", "maj", "", "min"}; String[] inversion = {"", "^", "", "^^", "", "^^^", "", "^^^^", "", "^^^^^"}; String[] key = {"",""}; String keys= " "; String randstr = " "; //this is the loop that defines the music legnth for (int i = 0; i &lt; 21; i++) { NoteNumber = rand.nextInt(7); NoteLength = rand.nextInt(8); OctiveNumber = rand.nextInt(18); ChordNumber = rand.nextInt(4); InversionNumber = rand.nextInt(10); NN[i] = note[NoteNumber]; // This randomly generates the note to be played. NL[i] = noteLength[NoteLength]; // This randomly generates the length of the note. ON[i] = octive[OctiveNumber]; // This defines the octive to be played in. CN[i] = chord[ChordNumber]; // This is defines the major or the minor IN[i] = inversion[InversionNumber]; // IN[i] = inversion[InversionNumber]; key[i] = NN[i] + NL[i] + ON[i] + CN[i] + IN[i]; //randstr = c[0] + " " + c[1] + " " + c[2] + " " + c[3] + " " + c[4] + " " + c[5] + " " + c[6] + " " + c[7] + " " + c[8] + " " + c[9] + " " + c[10] + " " + c[11] + " " + c[12] + " " + c[13] + " " + c[14] + " " + c[15] + " " + c[16]; keys = (key[0] + " " + key[1] + " " + key[2] + " " + key[3] + " " + key[4] + " " + key[5] + " " + key[6] + " " + key[7] + " " + key[8] + " " + key[9] + " " + key[10] + " " + key[11] + " " + key[12] + " " + key[13] + " " + key[14] + " " + key[15] + " " + key[16] + " " + key[17] + " " + key[18] + " " + key[19] + " " + key[20]); } System.out.println(key); Player player = new Player(); Pattern pattern = new Pattern(key[0]); player.play(pattern); } } </code></pre>
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    1. USAustin Kregel
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