Question

我是java初学者，对java的理解非常薄弱。对于我已经工作的代码，它已经计算了一个句子中的单词数，一个句子的总字符数和每个单词的总字符数，我想添加另一个函数。

我想添加一段代码来计算字长的平均值，例如，如果我输入“嗨嗨猫狗”，则输出为2.4。（因为这个句子的总字符数是12，除以单词的数量（5个单词）得到的平均值为2.4）。

下面是我正在编写的代码片段，这是我基于许多教程创建的代码，但它们都教授数字的平均值，而不是字长。我的想法是我的代码应该首先计算每个单词（word.length）的字符总和，然后除以单词之和（sentence.length）。但它似乎不起作用。 你能帮我纠正这段代码吗？

 { 
//prints out average word length
int length = wordcount / word.length ;
sum =  sum + word.length / sentence length; //this counts the sum of characters of words       and divides them by the number of words to calculate the average
System.out.println("The average word length is " + sum);} //outputs the sum calculated above


 {

下面有我的完整代码，可以帮助您更好地理解我的意思。谢谢你的帮助！

public class Main
{

    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in); //This adds a scaner/text window to the program.
        while(true)
        { // have created infinite loop.
            System.out.print("Enter your text or enter 'quit' to finish the program: ");
            String sentence = in.nextLine();
            if(sentence.equals("quit"))
            { // if enterd value is 'quit' than it comes out of loop
                break;
            }
            else
            {   //else if 'quit' wasn't typed it, the program displays whats underneath.

                System.out.println("You have entered: "
                        + sentence); // to print what the user has entered in the text window/scanner.
                System.out.println("The total number of characters is " + sentence.length()
                        + "."); // to print the total number of characters
                System.out.println("This piece of text has " + countWords(sentence)
                        + " words."); //this method counts the number of words in the entered sentence.


                String[] words =
                        sentence.split(" "); // to get the individual words, splits them when the free space (" ") is found.

                int maxWordLength = 0;
                int wordLength = 0;
                for(int i = 0; i < words.length; i++)
                {

                    wordLength = words[i].length();
                    if(wordLength > maxWordLength)
                    {       //This piece of code is an array which counts the number of words with the same number of characters.
                        maxWordLength = wordLength;
                    }
                }
                int[] intArray = new int[maxWordLength + 1];
                for(int i = 0; i < words.length; i++)
                {
                    intArray[words[i].length()]++;
                }
                for(int i = 1; i < intArray.length; i++)
                {
                    System.out.printf("There are " + "%d word(s) of length %d<\n>", intArray[i], i);
                }
                System.out.println("The numbers of characters for each word:");  //word.length method counts the number of characters for each word.
                for(int i = 0; i < words.length; i++)
                {
                    System.out.println(words[i] + " = " + words[i].length() + " characters");
                }
            }
        }
    }

    {
        //prints out average word length
        int length = wordcount / world.length;
        sum = sum + word.length / sentence
        length; //this counts the sum of characters of words and divides them by the number of words to calculate the average
        System.out.println("The average word length is " + sum);
    } //outputs the sum calculated above


    {
        in.close();
    }

    private static int countWords(String str)
    { //this piece of code splits the words when the space (" ") is found and prints out the length of words.
        String words[] = str.split(" ");
        int count = words.length;
        return count;
    }

}

Answer 1

您只需要拨打以下内容：

public static double getAverageCharLength(String str) {
    String words[] = str.split(" ");
    int numWords = words.length;
    int totalCharacters = 0;
    for(int i = 0; i < numWords; i++)
         totalCharacters = totalCharacters + words[i].length();

    return totalCharacters/numWords;
}

我无法告诉你哪里出错了，因为我无法理解你的代码混乱。但这是你应该遵循的逻辑。

注意：这不能正确计算平均字长如果您的字词包含撇号等特殊字符。我不确定您是否需要在您的情况下注意这一点，但如果您这样做，请查看正则表达式以指定要忽略的字符并使用String等contains()方法。

另请注意，您尝试定义的以下两种方法没有方法签名：

{
    //prints out average word length
    int length = wordcount / world.length;
    sum = sum + word.length / sentence
    length; //this counts the sum of characters of words and divides them by the number of words to calculate the average
    System.out.println("The average word length is " + sum);
} //outputs the sum calculated above


{
    in.close();
}

如果您不确定如何正确编写这些方法，可能会尝试浏览oracle文档中的Java语法。

Answer 2

使用拆分方法。这是一个例子：

//returns the average word length of input string s
//the method is of double type since it will likely not return an integer
double avgWordLength(String s){

   String delims=",;. ";//this contains all the characters that will be used to split the string (notice there is a blank space)

   //now we split the string into several substrings called "tokens"
   String[] tokens = s.split(delims);

   int total=0;//stores the total number of characters in words;

   for(int i=0; i<tokens.length(); i++){

      total += tokens[i].length(); //adds the length of the word to the total

   }

   double avg = total/tokens.length();

   return avg;

}

你有它。

Answer 3

你可以这样尝试

String input = "hello Alpha this is bravo";
        String[] strArray = input.split(" ");
        float totalChars = 0;
        for(String s : strArray){
            totalChars += s.length();
        }
        float words = strArray.length;
        float averageWordLength = (float)(totalChars/words);
        System.out.println(averageWordLength);

计算平均字长

3 个答案: