Java String Difference 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;
/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2002 The Apache Software Foundation.  All rights
 * reserved./*  w  ww  .  j  a v  a  2s .c o  m*/
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 * modification, are permitted provided that the following conditions
 * are met:
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.codehaus.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
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 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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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;
    }
}

Java String Difference differenceAt(String s1, String s2)

Description

License

Return

Declaration

Method Source Code

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