java - ''s cannot be resolved' ' 如何解决此错误？

Question

我是一个初学者，对Java的理解很薄弱。我使用 Dr.Java 并收到此错误:

     "S cannot be resolved"

使用这个 Java 程序:

import java.util.Scanner;

public class HDtest5

{
    public static int countWords(String str) {
        String words[] = str.split(" ");
        int count = words.length;
        return count;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Enter a sentence: ");
        String sentence = in.nextLine();
        System.out.print("Your sentence has " + countWords(sentence) + " words.");
    }

    {
        while (true) // have created infinite loop
        {

            if (s.equals("quit"))
            // if enterd value is "quit" than it comes out of loop

            {

                String[] words = s.split(" "); // get the individual words
                System.out.println("#words = " + words.length);
                for (int i = 0; i < words.length; i++)
                    System.out.println(s + "word[" + i + words[i] + " nchars = " + words[i].length());

            }
            System.out.println(s); // to Print string
            System.out.println(s.length()); // to print Entered string's length

        }
    }
}

什么原因导致此错误消息？我认为所有名为“s”的字符串应该可以毫无问题地一起工作。您能帮我找出问题所在吗？非常感谢您的帮助，非常感谢!

诗。更清楚地说，我的程序的目的是输出在文本窗口(扫描仪)中输入的文本的总字符数、每个单词的字符数和单词数。代码应该可以完美工作，除了这个字符串问题，它使得代码块不能一起工作。

Answer 1

我认为您想使用sentence 变量。并且您不会为 while 循环的每次迭代读取变量。

也许您想要更多类似的东西。

public class HDtest5 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (true) { // have created infinite loop
            System.out.print("Enter a sentence: ");
            String sentence = in.nextLine();
            System.out.print("Your sentence has " + countWords(sentence) + " words.");

            if (sentence.equals("quit")) { // if enterd value is "quit" than it comes out of loop
                break;
            } else {
                String[] words = sentence.split(" "); // get the individual words
                System.out.println("#words = " + words.length);
                for (int i = 0; i < words.length; i++)
                    System.out.println(sentence + "word[" + i + words[i] + " nchars = " + words[i].length());

            }
            System.out.println(sentence); // to Print string
            System.out.println(sentence.length()); // to print Entered string's length

        }
        in.close();
    }

    private static int countWords(String str) {
        String words[] = str.split(" ");
        int count = words.length;
        return count;
    }
}