LC151.Reverse Words in a String

Java:

public String reverseWords(String s) {
    String[] words = s.trim().split(" +");
    Collections.reverse(Arrays.asList(words));
    return String.join(" ", words);
}

1. list才是Collections的一种，才能用reverse;
2. String.join();

Python: easier:

return " ".join(s.strip().split()[::-1])