java字符串反转的7种方法

1、用stringbuffer或者stringbuilder自带的reverse方法

    public static string reversetestone(string s) {
        return new stringbuffer(s).reverse().tostring();
    }

2、将字符串拆分为char数组

    public static string reversetesttwo(string s) {
        char[] chararray = s.tochararray();
        int start = 0, end = chararray.length - 1;
        for (; start < end; start++, end--) {
            chararray[start] ^= chararray[end];//采用异或
            chararray[end] ^= chararray[start];
            chararray[start] ^= chararray[end];
        }
        return new string(chararray);
    }

两数交换除了用异或还能用其他方法，请移步

3、stringbuffer倒序拼接

    public static string reversetestthree(string s) {
        stringbuffer sb = new stringbuffer();
        for (int i = s.length() - 1; i >= 0; i--) {
            sb.append(s.charat(i));
        }
        return sb.tostring();
    }

4、利用栈的先进后出

    public static string reversetestfour(string s) {
        stringbuffer sb = new stringbuffer();
        stack stack = new stack();
        for (int i = 0; i < s.length(); i++) {
            stack.push(s.charat(i));
        }
        while (!stack.isempty()) {
            //stack会返回栈顶值，并且会把该值删除
            sb.append(stack.pop());
        }
        return sb.tostring();
    } 

5、二分换位反转

    public static string reversetestfive(string s) {
        int start = 0;
        int end = s.length() - 1;
        char[] chararray = s.tochararray();
        while (start < end) {
            //交换首尾char值
            char c = chararray[end];
            chararray[end] = chararray[start];
            chararray[start] = c;
            start++;
            end--;
        }
        return new string(chararray);
    }

6、切割递归反转

    public static string reversetestsix(string s) {
        if (s.length() <= 1) {
            return s;
        }
        return reversetestsix(s.substring(1)) + s.substring(0, 1);
    }

7、二分递归反转

    public static string reversetestseven(string s) {
        int length = s.length();
        if (length <= 1) return s;
        string left = s.substring(0, length / 2);
        string right = s.substring(length / 2, length);
        return reversetestseven(right) + reversetestseven(left);
    }

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