Java String Difference differenceAt(String s1, String s2)

Here you can find the source of differenceAt(String s1, String s2)

Description

Compare two strings, and return the index at which the strings begin to differ.

License

Apache License

Return

the index where s2 and s1 begin to differ; -1 if they are equal

Declaration

public static int differenceAt(String s1, String s2) 

Method Source Code

//package com.java2s;
/* ====================================================================
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 * reserved./*  w  ww  .  j  a v  a  2s .c o  m*/
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 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.codehaus.org/)."
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public class Main {
    /**
     * Compare two strings, and return the index at which the strings begin to differ.
     * <p>
     * E.g. strdiff("i am a machine", "i am a robot") -> 7
     * </p>
     *
     * @return the index where s2 and s1 begin to differ; -1 if they are equal
     **/
    public static int differenceAt(String s1, String s2) {
        int i;
        for (i = 0; (i < s1.length()) && (i < s2.length()); ++i) {
            if (s1.charAt(i) != s2.charAt(i)) {
                break;
            }
        }
        if ((i < s2.length()) || (i < s1.length())) {
            return i;
        }
        return -1;
    }
}

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