leetcode 151. Reverse Words in a String --------- java

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",
return "blue is sky the".

解题思路：

本题方法多多，最简单的方式直接按“ ” spilt即可，JAVA实现如下：

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public String reverseWords(String s) {

    if (s == null || s.length() == 0)

        return s;

    String[] str = s.split(" ");

    StringBuilder sb = new StringBuilder();

    for (int i = str.length - 1; i >= 0; i--)

        if (str[i].length() >= 1)

            sb.append(str[i] + " ");

    if (sb.length() > 1)

        sb.deleteCharAt(sb.length() - 1);

    return sb.toString();

}