Question

When I try to run my program, it gives the following error…

 Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 3
    at java.lang.String.charAt(Unknown Source)
    at Woordzoeker.check(Woordzoeker.java:88)
    at Woordzoeker.main(Woordzoeker.java:8)

I understand that the String probably went over the boundaries of an array, but I can’t seem to understand why. Could someone please assist me to understand the problem.

This is my code…

public class Woordzoeker {
    public static String[] words = {"boom","ma","maat","kas","kast","as","boek","boot"};
    public static String[][] grid = {{"b","o","e","k"},{"o","o","z","a"},{"o","j","o","s"},{"m","a","a","t"}};
    public static String[][] gridz = new String[4][4];

    public static void main(String[] args) {
        for (int x=0; x < words.length-1; x++){
            System.out.println(words[x] + " --> " + check(words[x],grid));
        } // THIS IS LINE 8
        System.out.println(isCorrectGrid(grid));
        System.out.println(isCorrectWords(words));
        }

public static int[] check(String word, String[][] grid){
    int[] array = new int[3];
    int y = 0;
    for (int rij=0; rij < grid.length; rij++){
        for (int kolom = 0;kolom < grid[rij].length; kolom++){
            for (int x=0; x < words.length - 1; x++)
                if (words[x].charAt(y) == (grid[rij][kolom].charAt(0))){  // THIS IS LINE 88
                    array[0] = rij;
                    array[1] = kolom;  // slaat de begin coordinaten op
            for (y = 0; y < words[x].length() - 1; y++){
                if (words[x].charAt(y) == grid[rij + y][kolom].charAt(0)){
                    array[2] = 1;
                }
                if (words[x].charAt(y) == (grid[rij][kolom + y].charAt(0))){
                    array[2] = 2;
                }
                if (words[x].charAt(y) == (grid[rij + y][kolom + y].charAt(0))){
                    array[2] = 3;
                }
            }
        }
    }
}

Answer 1

Maybe you should clear y after last for?

for (y = 0; y < words[x].length() - 1; y++){
   if (words[x].charAt(y) == grid[rij + y][kolom].charAt(0)){
   array[2] = 1;
   }
   if (words[x].charAt(y) == (grid[rij][kolom + y].charAt(0))){
   array[2] = 2;
   }
   if (words[x].charAt(y) == (grid[rij + y][kolom + y].charAt(0))){
   array[2] = 3;
   }

}
y=0;

check it