如何实现字符串的反转？

数据结构与算法

1.低级反转

I love you------>uoy evol I

public class Solution {
    public String reserve(String string) {
        if(string=null){
            return null;
        }
        char[] chars = string.toCharArray();
        for (int i = 0; i < chars.length / 2; i++) {
            swap(chars, i, chars.length - 1 - i);
        }
        return new String(chars);
    }
    public void swap(char[] chars, int i, int j) {
        char temp = chars[i];
        chars[i] = chars[j];
        chars[j] = temp;
    }
    public static void main(String[] args) {
        Solution solution = new Solution();
        String string = "I love you";
        System.out.println(solution.reserve(string));
    }
}

2.高级反转

I love you -->you love I
换汤不换药

public class Solution {
    public String reserve(String string) {
        if (string == null || string.length() == 0) {
            return null;
        }
        String[] strs = string.split(" ");
        for (int i = 0; i < strs.length / 2; i++) {
            swap(strs, i, strs.length - 1 - i);
        }
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < strs.length; i++) {
            sb.append(strs[i] + " ");
        }
        return sb.toString();
    }
    public void swap(String[] strs, int i, int j) {
        String temp = strs[i];
        strs[i] = strs[j];
        strs[j] = temp;
    }
    public static void main(String[] args) {
        Solution solution = new Solution();
        String string = "I love you";
        System.out.println(solution.reserve(string));
    }
}