public class Solution {
/**
* @param s : A string
* @return : A string
*/
public String reverseWords(String s) {
// write your code
if (s == null) return s;
if (s.length() == 0) return s;
ArrayList<String> list = generateWord(s);
reverseWordList(list);
return generateResult(list);
}
private String generateResult(ArrayList<String> list) {
int length = list.size();
StringBuilder sb = new StringBuilder();
for (int i = 0; i< length; i++) {
sb.append(list.get(i));
if (i != length - 1) sb.append(" ");
}
return sb.toString();
}
private void swap(ArrayList<String> list,int start, int end) {
String tmp = list.get(start);
list.set(start, list.get(end));
list.set(end, tmp);
}
private void reverseWordList(ArrayList<String> list) {
int length = list.size();
int start = 0;
int end = length - 1;
while (start < end) {
swap(list, start, end);
start++;
end--;
}
}
private ArrayList<String> generateWord(String s) {
int length = s.length();
ArrayList<String> rst = new ArrayList<>();
for (int i = 0; i < length; i++) {
if (s.charAt(i) == ' ') continue;
int start = i;
while (i < length && s.charAt(i) != ' ') {
i++;
}
String word = s.substring(start, i);
rst.add(word);
}
return rst;
}
}
53.Reverse Words in a String
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