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Chapter 05 _Objects and Classes(core JavaÕªÒª)

Basic concepts in OOP
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import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;
public class RegexUtil {
private static Pattern PATTERN_EMAIL = Pattern
.compile("^[\\w-]+(\\.[\\w-]+)*@[\\w-]+(\\.[\\w-]+)+$");// ÓʼþµØÖ·
private static Pattern PATTERN_TEL = Pattern
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import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.URL;
import java.util.*;
public class Typewriter4 extends Applet implements Runnable
{
    AudioClip hit, cr, ding ;
    boolean alreadyRun = false,
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