Medium
重要的String method:
String str;
str.trim()
str.replaceAll(" +", " ");
还有StringBuilder的一个method也挺好用，叫sb.deleteCharAt();
public class Solution {
public String reverseWords(String s) {
s = s.trim().replaceAll(" +", " ");;
if (s == null || s.length() == 0){
return "";
}
String[] words = s.split(" ");
StringBuilder sb = new StringBuilder();
for (int i = words.length - 1; i >= 0; i--){
sb.append(words[i]);
sb.append(" ");
}
sb.deleteCharAt(sb.length() - 1);
return sb.toString();
}
}
