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

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

Update (2015-02-12):
For C programmers: Try to solve it in-place in O(1) space.

click to show clarification.

Clarification:

  • What constitutes a word?
    A sequence of non-space characters constitutes a word.
  • Could the input string contain leading or trailing spaces?
    Yes. However, your reversed string should not contain leading or trailing spaces.
  • How about multiple spaces between two words?
    Reduce them to a single space in the reversed string.

题目大意:给一个String,以空格分隔,以单词为单位反转这个String。

解题思路:用java自带的split,拆成数组,然后组合。。。

    public String reverseWords(String s) {
if (s == null || s.length() == 0) {
return s;
}
String[] res = s.split(" ");
if (res.length == 0) {
return "";
}
StringBuilder sb = new StringBuilder();
for (int i = res.length - 1; i >= 0; i--) {
if ("".equals(res[i])) {
continue;
}
sb.append(res[i]).append(" ");
}
return sb.substring(0, sb.length() - 1);
}

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