题解 | #单词倒排#

import java.util.Scanner;

// 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);
        String str = in.nextLine();
        int a = 'a';
        int z = 'z';
        int A = 'A';
        int Z = 'Z';
        Boolean lastIsZm = false;
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < str.length(); i++) {
            Character curChar = str.charAt(i);
            int curCharInt = (int)curChar;
            if ((curCharInt > a - 1 && curChar < z + 1) || (curCharInt > A - 1 &&
                    curChar < Z + 1)) {
                sb.append(curChar);
                lastIsZm = true;
            } else {
                if (lastIsZm) {
                    if (i != str.length() - 1) {
                        sb.append(" ");
                    }
                }
                lastIsZm = false;
            }
        }
        String str2 = sb.toString();
        String[] strArray = str2.split(" ");
        for(int i = strArray.length-1;i>-1;i--){
           System.out.print(strArray[i]); 
           if(i!=0){
             System.out.print(" "); 
           }
        }
    }

}