输入一行字符(少于300个字符)，以回车结束，统计其中单词的个数。各单词之间用空格分隔，空格数可以是多个。用java解决

以下是使用Java解决输入一行字符统计单词个数的示例代码：

import java.util.Scanner;

public class WordCount {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入一行字符：");
        String input = scanner.nextLine();
        int count = countWords(input);
        System.out.println("这个字符串有" + count + "个单词");
    }

    public static int countWords(String input) {
        int count = 0;
        boolean isWord = false;
        for (int i = 0; i < input.length(); i++) {
            char c = input.charAt(i);
            if (Character.isLetter(c)) {
                isWord = true;
            } else if (isWord) {
                count++;
                isWord = false;
            }
        }
        if (isWord) {
            count++;
        }
        return count;
    }
}