Java Array Index Out of Bounds Exception saying that array is smaller than it actually is

Question

My program is comparing two strings inside two for loops. Upon running, it produces the error: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2 , even though the arrays are initialized for enough space. The line of code is:

if(keywords[a].equals(tokenizedString[b])&&tokenizedString[a].equals("1"))

Where keywords is initialized:

String[] keywords={"0","add","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};

Where tokenizedString is initialized:

String[] tokenizedString={"0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};

Why, when I run it, is it saying that two is out of bounds when the only two arrays being used in that statement are obviously bigger?

The relevant part of code:

import java.util.Scanner;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) {
        final int KEYWORDS = 3;
        String[] keywords =
                        {"0", "add", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0",
                                        "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0",
                                        "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0",
                                        "0", "0", "0", "0", "0", "0", "0"};
        Scanner scan = new Scanner(System.in);
        String[] tokenizedString =
                        {"0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0",
                                        "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0",
                                        "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0", "0",
                                        "0", "0", "0", "0", "0", "0"};
        int stringCounter = 1;
        String input = scan.nextLine();
        StringTokenizer st = new StringTokenizer(input, " ");
        String answer = null;
        while (st.hasMoreElements()) {
            answer = (String) st.nextElement();
            System.out.println(answer);
            tokenizedString[stringCounter] = answer;
            stringCounter++;
        }
        String[] functions;
        functions = new String[10];
        functions = testForKeywords(tokenizedString, keywords, stringCounter, KEYWORDS);
        int[] numbers = new int[10];
        String[] numberss = {"1", "2"};
        numbers = testForNumbers(tokenizedString, numberss, stringCounter, 2);
    }

    public static int[] testForNumbers(String[] tokenizedString, String[] keywords, int inputs,
                    int numbKeywords) {
        int[] functions = new int[inputs + 1];
        int funCounter = 0;
        for (int a = 0; a <= numbKeywords; a++) {
            for (int b = 0; b <= inputs; b++) {
                if (keywords[a].equals(tokenizedString[b]) && tokenizedString[a].equals("1")) {
                    System.out.println("Yay");
                    functions[funCounter] = 1;
                    funCounter++;
                }
            }
        }
        return functions;
    }
}

Answer 1

You are confused as to the value of keywords at the point the error occurs.

Your error occurs in testForNumbers() where you have a local (method scope) variable keywords passed in as an argument. If you look where you call this, you pass in numberss in this position.

numberss has only two members - so has indexes 0 and 1 only - trying to access index 2 will indeed throw this Exception at runtime