查找两个字符串之间的差异 [英] Find difference between two Strings

问题描述

假设我有两个长字符串。他们几乎是一样的。

Suppose I have two long strings. They are almost same.

String a = "this is a example"
String b = "this is a examp"

上面的代码只是举例。实际字符串相当长。

Above code is just for example. Actual strings are quite long.

问题是一个字符串比另一个字符串有 2个字符。

Problem is one string have 2 more characters than the other.

如何检查哪两个字符？

How can I check which are those two character?

推荐答案

您可以使用StringUtils.difference(String first，String second）。

这是他们如何实现它：

public static String difference(String str1, String str2) {
    if (str1 == null) {
        return str2;
    }
    if (str2 == null) {
        return str1;
    }
    int at = indexOfDifference(str1, str2);
    if (at == INDEX_NOT_FOUND) {
        return EMPTY;
    }
    return str2.substring(at);
}

public static int indexOfDifference(CharSequence cs1, CharSequence cs2) {
    if (cs1 == cs2) {
        return INDEX_NOT_FOUND;
    }
    if (cs1 == null || cs2 == null) {
        return 0;
    }
    int i;
    for (i = 0; i < cs1.length() && i < cs2.length(); ++i) {
        if (cs1.charAt(i) != cs2.charAt(i)) {
            break;
        }
    }
    if (i < cs2.length() || i < cs1.length()) {
        return i;
    }
    return INDEX_NOT_FOUND;
}

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