Java 句子缩短程序无法正常工作

Question

import java.util.Scanner;
public class SentenceShortener {

    public static void main(String[] args) {
        
        Scanner kbd = new Scanner(System.in);
        String sentence = "";
        String sentence2 = "";
        String sentence3 = "";
        String finalcount = "";
        
        System.out.println("Input sentence ");
        
        sentence = kbd.nextLine();
        int space = sentence.indexOf(" ");
        System.out.println(sentence.substring(space+1));
        
        sentence2 = sentence.substring(space+1);
        int space2 = sentence.indexOf(" ");
        System.out.println(sentence2.substring(space2+1));
        
        sentence3 = sentence2.substring(space2+1);
        int space3 = sentence2.indexOf(" ");
        System.out.println(sentence3.substring(space3+1));
        
        finalcount = sentence3.substring(space3+1);
        
        System.out.println("Your " + sentence.length() + " character long sentence was shortened to " + finalcount.length() + " characters.");
    }

}

我创建了一个程序，它应该缩短四个单词的句子，然后再缩短到越来越短的“句子”，并计算你将句子缩短到多少个字符。

它应该是这样工作的：

Input sentence
The car runs good.
car runs good.
runs good.
good.
Your 18 character long sentence was shortened to 6 characters.

实际上如何运行s:

Input sentence 
The car runs good.
car runs good.
runs good.
 good.
Your 18 character long sentence was shortened to 6 characters.

另一个运行:

Input sentence 
Why is it raining?
is it raining?
t raining?
aining?
Your 18 character long sentence was shortened to 7 characters.

我是 Java 的初学者。

Answer 1

确定 space 索引的逻辑不正确。尝试修改您的代码以具有

int space2 = sentence2.indexOf(" ");
int space3 = sentence3.indexOf(" ");

Java 句子缩短程序无法正常工作

Java sentence shortening program doesn't work right

java

string

substring

indexof

sentence