Question

Since I couldn’t figure out an easy way to convert my string array into an integer array, I looked up an example for a method and here is what I ended up with:

private int[] convert(String string) {
    int number[] = new int[string.length()];

    for (int i = 0; i < string.length(); i++) {
        number[i] = Integer.parseInt(string[i]); // error here
    }
return number;
}

parseInt requires a string which is what string[i] is but the error tells me “The type of the expression must be an array type but it resolved to String”

I can’t figure out what is the problem with my code.

EDIT: I’m an idiot. Thanks all it was obvious.

Answer 1

You’re trying to read a string as if it were an array. I assume you’re trying to go through the string one character at a time. To do that, use .charAt()

private int[] convert(String string) {
    int number[] = new int[string.length()];

    for (int i = 0; i < string.length(); i++) {
        number[i] = Integer.parseInt(string.charAt(i)); //Note charAt
    }
   return number;
}

If you expect the string to be an array of strings, however, you left out the array identifier in the function prototype. Use the following corrected version:

private int[] convert(String[] string) { //Note the [] after the String.
    int number[] = new int[string.length()];

    for (int i = 0; i < string.length(); i++) {
        number[i] = Integer.parseInt(string[i]);
    }
   return number;
}