题解 | #单词倒排#

java 通俗易懂版
转化成char[] 利用两个变量 index end ---> 找到单词

import java.util.Scanner;
public class H31 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = "  " + sc.nextLine();
        int index = 0;
        int end = 0;
        StringBuilder sb = new StringBuilder();
        char[] chars = str.toCharArray();
        for (int i = chars.length - 1; i >= 0; i--) {
            if (Character.isLowerCase(chars[i]) || Character.isUpperCase(chars[i])) {
                index = index == 0 ? i : index;
            } else {
                end = index != 0 ? i : index;
            }
            if (index != 0 && end != 0) {
                sb.append(str.substring(end+1, index+1) + " ");
                index = 0;
                end = 0;
            }
        }
        System.out.println(sb.toString());
    }
}