java - 类方法如何将存储的数据传递给同一类中的其他方法

Question

我从我正在学习的书中学习了这门类(class)。但书中并没有准确解释 then 的 translate 方法的返回值如何在下面的 translateWord 方法中使用，等等。书上唯一说的是:

The translate method passes each word to the private support method translateWord.

是的，但我想知道这是怎么发生的。我问是因为我已经结束了JAVA CLASSES的章节，而且我还不明白这个过程。

import java.util.Scanner;

public class PigLatinTranslator {

    //-------------------------------------------------------------
    //Translates a sentence of words into Pig Latin.
    //-------------------------------------------------------------
    public static String translate(String sentence)
    {
        String result = "";

        sentence = sentence.toLowerCase();

        Scanner scan = new Scanner(sentence);

        while(scan.hasNext())
        {
            result += translateWord(scan.next());
            result += " ";
        }

        return result;
    }

    //-----------------------------------------------------------------------
    //Translates one word into Pig Latin. If the word begins with a vowel,
    //the suffix 'yay' is appended to the word. Otherwise, the first letter
    //or two are moved to the end of the word, and 'ay' is appended.
    //-----------------------------------------------------------------------
    private static String translateWord(String word)
    {
        String result = "";

        if(beginsWithVowel(word))
            result = word + "yay";
        else
            if(beginsWithBlend(word))
                result = word.substring(2) + word.substring(0,2) + "ay";
            else
                result = word.substring(1) + word.charAt(0) + "ay";

        return result;

    }

    //--------------------------------------------------------------------
    //Determines if the specified word begins with a vowel.
    //--------------------------------------------------------------------
    private static boolean beginsWithVowel(String word)
    {
        String vowels = "aeiou";

        char letter = word.charAt(0);

        return(vowels.indexOf(letter) != -1);
    }

    //------------------------------------------------------------------------
    //Determines if the specified word begins with a particular two-character
    //consonant blend.
    //------------------------------------------------------------------------
    private static boolean beginsWithBlend(String word)
    {
        return( word.startsWith("bl") || word.startsWith("sc") ||
                word.startsWith("br") || word.startsWith("sh") ||
                word.startsWith("ch") || word.startsWith("sk") ||
                word.startsWith("cl") || word.startsWith("sl") ||
                word.startsWith("cr") || word.startsWith("sn") ||
                word.startsWith("dr") || word.startsWith("sm") ||
                word.startsWith("dw") || word.startsWith("sp") ||
                word.startsWith("fl") || word.startsWith("sq") ||
                word.startsWith("fr") || word.startsWith("st") ||
                word.startsWith("gl") || word.startsWith("sw") ||
                word.startsWith("gr") || word.startsWith("th") ||
                word.startsWith("kl") || word.startsWith("tr") ||
                word.startsWith("ph") || word.startsWith("tw") ||
                word.startsWith("pl") || word.startsWith("wh") ||
                word.startsWith("pr") || word.startsWith("wr"));

    }







}   

Answer 1

作为 Javadoc 显示，next()方法返回一个字符串。 translateWord(String word)接受字符串作为参数，因此到一天结束时任何内容都会解析为 String可以传递给这个方法。

因此，这一行:translateWord(scan.next());本质上是以下代码的简写:

String scannerInput = scan.next();
translateWord(scannerInput);

给定一个字符串，This is a test ，扫描仪将返回 This , is , a , test 。因此，这些字符串将被输入到您的 translateWord方法。