题解 | #单词倒排#--将非字符变为空格符分割后倒序

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNextLine()) {
            String str = in.nextLine();
            char[] chars = str.toCharArray();
            char[] newChars = new char[chars.length];
            // 将非字符字符变为空格符
            for (int i = 0; i < chars.length; i++) {
                if ((chars[i] >= 65 && chars[i] <= 90) || (chars[i] >= 97 && chars[i] <= 122)) {
                    newChars[i] = chars[i];
                } else {
                    newChars[i] = ' ';
                }
            }
            String newStr = new String(newChars);
            String[] strs = newStr.split(" ");
            for (int i = strs.length - 1; i >=0; i--) {
                System.out.print(strs[i] + " ");
            }
        }
    }
}