151. 翻转字符串里的单词

代码

class Solution {
    public String reverseWords(String s) {
        /**
        1." "分割
        2.前后置换
        3.拼接
         */
        String [] ss = s.trim().split("\\s+");
        int size = ss.length;
        int left = 0,right = size -1;
        while(left < right ) {
            String temp = ss[left];
            ss[left++] = ss[right];
            ss[right--] = temp;
        }
        StringBuilder sb = new StringBuilder();
        for(int i = 0; i < size - 1; i++ ) {
            sb.append(ss[i]).append(" ");
        }
        sb.append(ss[size - 1] );
        return sb.toString();
    }
}