Java String Difference difference(String str1, String str2)

Description

difference

License

Apache License

Declaration

public static String difference(String str1, String str2) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    public static String difference(String str1, String str2) {
        if (str1 == null) {
            return str2;
        }/*from  ww  w.j a  v  a  2 s .co  m*/
        if (str2 == null) {
            return str1;
        }
        int at = indexOfDifference(str1, str2);
        if (at == -1) {
            return "";
        }
        return str2.substring(at);
    }

    public static int indexOfDifference(String str1, String str2) {
        if (str1.equals(str2)) {
            return -1;
        }
        if ((str1 == null) || (str2 == null)) {
            return 0;
        }
        int i = 0;
        for (; (i < str1.length()) && (i < str2.length()); i++) {
            if (str1.charAt(i) != str2.charAt(i)) {
                break;
            }
        }
        if ((i < str2.length()) || (i < str1.length())) {
            return i;
        }
        return -1;
    }
}

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