Dev Minded

As my first post, to test the layout and some plugins, I have decided to share a little Java class that converts a String input to an int. While it is not perfect, it seems to work well enough under the constraint of not using library functions to do the conversion.

When I wrote it I decided to just throw decimal point entry to the wayside. However, looking back at it I could have allowed it and either floored the value or only permitted whole number values.

Overall I think this implementation handles the problem statement without over-complicating matters.

public class StringToInt {

	public static int strToInt(String input) {
		
		int number = 0;
		int negFlag = 1;
		int count = 0;
		for (char s : input.toCharArray()) {
			if (s == '-') {
				if (count > 0) {
					throw new NumberFormatException();
				}
				negFlag = -1;
				continue;
			}
			if (s < '0' || s > '9') {
				throw new NumberFormatException();
			}
			number *= 10;
			
			number += (s - '0');
			
		}
		return number * negFlag;
	}
}