题解 | #单词倒排#

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while (sc.hasNextLine()) {
            String str = sc.nextLine();
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < str.length(); i++) {
                if(Character.isLetter(str.charAt(i))){
                    sb.append(str.charAt(i));
                }else{
                    sb.append(' ');
                }
            }
            ArrayList<String> list = new ArrayList<>();
            String[] split = sb.toString().split(" ");
            for (int i = 0; i < split.length; i++) {
                if(" ".equals(split[i])){
                    continue;
                }else{
                    list.add(split[i]);
                }
            }
            for (int i = list.size()-1; i >= 0; i--) {
                if(i == 0){
                    System.out.println(list.get(0));
                }else{
                    System.out.print(list.get(i)+" ");
                }
            }
        }
    }
}