初学java笔记1

初学java，终于肯动手自己写程序了，原来写起来才知道自己基础很不好啊，这是今晚的学习笔记：
    1。多路选择语句switch只能用int 类型;
    2。”a“表示了一个字符串，‘a’表示了一个字符;
以下是今晚自己的代码：
    这个是学习字符串时写的一个将输入的字符转换成暗语：

import java.util.*;

public final class PigLatin
{
    private PigLatin(){}
   
    public static String translate(String plain){
        StringBuffer result = new StringBuffer("");
        StringTokenizer words = new StringTokenizer (plain);
        while(words.hasMoreTokens()){
            result.append(translateWord(words.nextToken()) + " ");
        }
        return result.toString();
    } //translate()

   
    private static String translateWord(String word){
        int num = findFirstVowel(word);
        StringBuffer result = new StringBuffer("");
        if (num == 0)
            return word + "yay";
        else{
            result.append(word.substring(num) + word.substring(0,num-1) + "ay");
            return result.toString();
        }
    } //transtlateWord()

   
    private static int findFirstVowel(String word){
        char vowel;
        for(int k=0; k < word.length(); k++){
            vowel = word.charAt(k);
            if (vowel == 'a' || vowel == 'e' || vowel == 'i' || vowel == 'o' || vowel == 'u')
                return k;
        }
        return 0;
    } //findFirstVowel()

} //PigLatin



以下是Applet:

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;

public class PigLatinApplet extends Applet implements ActionListener
{
    private Label prompt = new Label("Input a word and : ");
    private TextField input = new TextField(30);
    private TextArea display = new TextArea(10,40);
    
    public void init(){
        add(prompt);
        add(input);
        input.addActionListener(this);
        add(display);
        display.setEditable(false);
    } // init()

    
    public void actionPerformed(ActionEvent e){
        String plaintext = input.getText();
        display.append(plaintext + "\n" +
                PigLatin.translate(plaintext) + "\n");
    } //actionPerformed()

}