Question

以下内容按顺序打印输入的句子。我需要它以相反的顺序打印输入：

import java.util.Scanner;


public class Sentence {
    public static void main(String [] args) {
        Scanner input = new Scanner(System.in);
        System.out.print("Enter a sentence: ");
        String sentence = input.nextLine();

        String[] tokens = sentence.split(" ");
        System.out.println(tokens.length);

        for (String token : tokens) {
            System.out.println(token);
        }   
    }
}

Answer 1

使用常规的for循环并从最后一个索引打印到第一个索引：

for (int i = tokens.length-1; i>=0;i--) {
        System.out.println(tokens [i]);
    }

Answer 2

您将按照句子的顺序打印标记，而绝不会颠倒它。尝试反向循环

for(int i = tokens.length -1; i >= 0; i--)
{
  System.out.println(tokens[i]);
}

Answer 3

您可以使用它来反转句子。它将打印：句子a是This

    String sentence = "This is a sentence";

    String[] tokens = sentence.split(" ");
    System.out.println(tokens.length);

    for (int i = tokens.length-1; i >= 0; --i) {
        System.out.print(tokens[i]);
        System.out.print(" ");
    }

字符串令牌的反向输出

3 个答案: