在字符串方法中计算单词? [英] Count words in a string method?

问题描述

我想知道如何编写一个方法来仅使用 charAt、length 或 substring 等字符串方法来计算 java 字符串中的单词数.

I was wondering how I would write a method to count the number of words in a java string only by using string methods like charAt, length, or substring.

循环和 if 语句没问题！

Loops and if statements are okay!

我非常感谢我能得到的任何帮助！谢谢！

I really appreciate any help I can get! Thanks!

推荐答案

public static int countWords(String s){

    int wordCount = 0;

    boolean word = false;
    int endOfLine = s.length() - 1;

    for (int i = 0; i < s.length(); i++) {
        // if the char is a letter, word = true.
        if (Character.isLetter(s.charAt(i)) && i != endOfLine) {
            word = true;
            // if char isn't a letter and there have been letters before,
            // counter goes up.
        } else if (!Character.isLetter(s.charAt(i)) && word) {
            wordCount++;
            word = false;
            // last word of String; if it doesn't end with a non letter, it
            // wouldn't count without this.
        } else if (Character.isLetter(s.charAt(i)) && i == endOfLine) {
            wordCount++;
        }
    }
    return wordCount;
}

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