Runtime8 msBeats60.13%
Memory42.3 MBBeats87.73%
#N151. Reverse Words in a String
problem link
#solution

class Solution {
    public String reverseWords(String s) {
        String[] arr = s.split("\\s+");
        for(int i = 0, j = arr.length-1; i<j; ){
            if(arr[i].equals("")){
                i++; continue;
            }
            if(arr[j].equals("")){
                j--; continue;
            }
            String temp = arr[i];
            arr[i] = arr[j];
            arr[j] = temp;
            i++; j--;
        }
        StringBuilder sb = new StringBuilder();
        for(String ss: arr) {
            if(!ss.equals("")) sb.append(ss).append(" ");
        }
        return sb.toString().trim();
    }
}