[LeetCode] Reverse Words in a String
2014-09-14 16:43
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原题:https://oj.leetcode.com/problems/reverse-words-in-a-string/
题解：该题通过Java来解非常简单，通过split函数按空格分隔即可，但是本题有很多陷阱；比如字符串收尾有空格，或本身就是一个空格；这时就需要去判断分隔后的元素的长度，代码如下：
题解：该题通过Java来解非常简单，通过split函数按空格分隔即可，但是本题有很多陷阱；比如字符串收尾有空格，或本身就是一个空格；这时就需要去判断分隔后的元素的长度，代码如下：
public class Solution {
public String reverseWords(String s) {
if(s == null)
return s;
String[] sa = s.split(" ");
StringBuilder sb = new StringBuilder();
boolean first = true;
for(int i = sa.length-1; i >= 0; i--){
if(sa[i].length() != 0){
if(first){
sb.append(sa[i]);
first = false;
}
else{
sb.append(" ").append(sa[i]);
}
}
}
return sb.toString();
}
}
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