题解 | #单词倒排#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str = in.nextLine();
            // System.out.println(str);
            ArrayList<String> list = getStrArr(str);
            // System.out.println(list);
            int n = list.size();
            for(int i = n-1;i>-1;i--){
                if(i==0){
                    System.out.print(list.get(i));
                } else {
                    System.out.print(list.get(i)+" ");
                }
            }
        }
    }

    public static ArrayList<String> getStrArr(String input) {
        ArrayList<String> wordList = new ArrayList<String>();
        int n = input.length();

        String tempStr = "";
        for (int i = 0; i < n; i++) {
            char tempChar = input.charAt(i);
            // System.out.println(tempChar);

            if ((tempChar >= 'A' && tempChar <= 'Z') || (tempChar >= 'a' &&
                    tempChar <= 'z')) {
                tempStr = tempStr + tempChar;
                if (i == n - 1) {
                    wordList.add(tempStr);
                }
            } else {
                if (!tempStr.equals("")) {
                    wordList.add(tempStr);
                    // System.out.println(tempStr);
                    tempStr = "";
                    continue;
                } else {
                    continue;
                }
            }
        }

        return wordList;

    }
}