自定义字符串反向的Java [英] Customized String Reverse Java

问题描述

我只是想问问，有没有一种方法，可能你定制扭转Java字符串的方式吗？例如，这是我的样本输入：

I would just like to ask, is there a way to possibly customize the way you reverse strings in java? For example, this is my sample input:

蓝色大鸟飞。

在那里，我可以扭转例如像字符串的某些部分，由3什么办法？

is there any way that I can reverse some parts of the string like for example, by 3?

所以输出将是：

Theib摹beul双向DRIS ylfing。

Theib g beul bi dris ylfing .

的字符串是后3个字符每逆转。这可能吗？

The string is reverse every after 3 characters. is this possible?

推荐答案

方法：通过参数迭代的输入字符串的所有字符（例如，你的情况参数= 3）确定的部分用一个布尔标志的帮助下被逆转。如果部分子不被逆转其追加到的结果，其反向否则追加到一个StringBuilder对象的帮助的结果。给这个code一试，我希望它能帮助：

Methodology: Iterate over all the characters of your input string by a parameter (e.g. in your case param=3) Determine the parts to be reversed with the help of a boolean flag. If the partial substring is not to be reversed append it to the result, otherwise append its reverse to the result with the help of a StringBuilder object. Give this code a try, I hope it helps:

public static String customizedReverse(String str, int param)
{
    String result = "";
    boolean reverse = false;
    StringBuilder sb = null;
    int size = str.length(), i = 0;

    if(param > size)
        return str;

    for (i = 0; i < (size/param)*(param); i += param)
    {
        String temp = str.substring(i, i + param);
        if (!reverse)
            result += temp;
        else
        {
            sb = new StringBuilder(temp);
            result += sb.reverse();
        }
        reverse = !reverse;
    }
    // Appending the remaining part of the string       
    if (!reverse)
        result += str.substring(i, size);
    else
    {
        sb = new StringBuilder(str.substring(i, size));
        result += sb.reverse();
    }

    return result;
}

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