计数第X字母词的频率是多少？ [英] Count the Frequency of X letter words?

问题描述

我要创建一个程序，它计算的x的单词字母的频率/发生，我已经得到了计划制定出单词的频率和长度，但现在我需要计算出的平均长度进入的话，我真的卡在这，所以如果有人可以帮助我将不胜感激

i have to create a program where it counts the frequency/occurrence of X letter of words, i have got the program to work out the frequency of the words and the lengths but now i need to work out the mean length of the words entered, i am really stuck on this so if anyone can help i will be grateful

这是在code，我有作为尚未：

This is the code i have as of yet:

import javax.swing.JOptionPane;
public class CountLetters {
public static void main( String[] args ) {
    String input = JOptionPane.showInputDialog("Write a sentence." );
    int amount = 0;
    String output = "Amount of letters:\n";

    for ( int i = 0; i < input.length(); i++ ) {
        char letter = input.charAt(i);
        amount++;
        output = input;
    }
    output += "\n" + amount;
    JOptionPane.showMessageDialog( null, output,
                         "Letters", JOptionPane.PLAIN_MESSAGE ); 
}
}

推荐答案

使用一个映射到字长度映射到字长发生的次数。

Use a map to map the word length to the number of times that word length occurs.

然后按照添B的回答乘法逻辑。

Then follow the multiplicative logic of Tim B's answer.

一个简单的例子我扔在一起。

A quick example I threw together.

public static void main(final String[] args) {
        final Map<Integer, Integer> wordLengths = new HashMap<Integer, Integer>();

        final String testString = "the quick brown fox jumped over the lazy dog";
        final String[] words = testString.split(" ");

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

            if( wordLengths.keySet().contains( wordLength ) ) {
                Integer currentNumberOfOccurences = wordLengths.get(wordLength);
                currentNumberOfOccurences++;
                wordLengths.put(wordLength, currentNumberOfOccurences);
                continue;
            }

            wordLengths.put(wordLength, 1);
        }

        double totalLength = 0;
        double totalOccurrences = 0;
        for (final Integer length : wordLengths.keySet()) {
            final Integer occurrences = wordLengths.get(length);
            totalLength = totalLength + (length * occurrences );
            totalOccurrences += occurrences;
        }

        final double mean = totalLength / totalOccurrences;

        System.out.println("Average word length is: " + mean );
    }

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