题解 | #翻转单词#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param str string字符串 
     * @return string字符串
     */
    public String reverseWord(String str) {
        // write code here
        if (1 == str.length()) {
            return str;
        }
        StringBuffer sb = new StringBuffer("");
        int index = 0;
        int sign = 0;
        for (int i = 0; i < str.length(); i++) {
            char chr = str.charAt(i);
            if (chr == ' ') {
                if (sign == 1) {
                    StringBuffer tmpSB = new StringBuffer(str.substring(index, i));
                    tmpSB.reverse();
                    sb.append(tmpSB);
                    sign = 0;

                }
                sb.append(chr);
            } else {
                if (sign == 0) {
                    index = i;
                    sign = 1;
                }
            }
        }
        if (sign == 1) {
            StringBuffer tmpSB = new StringBuffer(str.substring(index));
            tmpSB.reverse();
            sb.append(tmpSB);
        }
        return new String(sb);
    }
}