java试图编写代码来计算句子中单词的平均长度

Question

代码需要有一个带有参数String s的方法averageLength。该方法需要以double值的形式返回s中单词的平均长度。假设s只由单个空格分隔的单词组成，没有任何前导空格或尾随空格。我在下面有一个代码，可以找到单词的平均长度，但它没有averageLength方法：

import java.util.Scanner;

class main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("Please type in your sentence, then press enter: ");

        String words = sc.nextLine();

        int count = 0;
        double sum = 0;
        double average = 0;

        sc = new Scanner(words);

        while (sc.hasNext()) {

            String userInput = sc.next();

            double charNum = userInput.length();
            sum = charNum + sum;
            count++;

            if (count > 0) {
                average = sum / count;
            }
        }
        System.out.println("Average word length = " + average);
    }
}

Answer 1

首先，声明一个返回double并接受String参数的方法

  private static double returnAverageLength(String sentence){

借助split()方法，我们把句子分成几个单词

  String [] words = sentence.split(" ");

使用for循环，我们计算句子中的所有字符

for(int i=0;i<words.length;i++){
            countCharacters+= words[i].length();
        }

然后我们返回平均结果

return countCharacters / words.length;

完整代码

public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

       System.out.println("Write sentence");
       String s = scanner.nextLine();

       double average = returnAverageLength(s);

        System.out.println("AVERAGE IS " + average);

    }

    private static double returnAverageLength(String sentence){

        String [] words = sentence.split(" ");

        double countCharacters = 0;

        for(int i=0;i<words.length;i++){
            countCharacters+= words[i].length();
        }



        return countCharacters / words.length;
    }

    
}

输出

Write sentence
Hello From Stackoverflow
AVERAGE IS 7.33