Java - Write code to Compare two strings, character by character, and returns the first position where the two strings differ from one another.

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Requirements

Write code to Compare two strings, character by character, and returns the first position where the two strings differ from one another.

Demo

//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String s1 = "book2s.com";
        String s2 = "book2s.com";
        System.out.println(stringDifference(s1, s2));
    }//ww  w  . j av  a2s .  c om

    /**
     * Compares two strings, character by character, and returns the
     * first position where the two strings differ from one another.
     *
     * @param s1 The first string to compare
     * @param s2 The second string to compare
     * @return The first position where the two strings differ.
     */
    public static final int stringDifference(String s1, String s2) {
        int len1 = s1.length();
        int len2 = s2.length();
        int len = len1 < len2 ? len1 : len2;
        for (int i = 0; i < len; i++) {
            if (s1.charAt(i) != s2.charAt(i)) {
                return i;
            }
        }
        return len;
    }
}

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