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      package quiz;
import java.lang.reflect.Field;
public class ClassLoaderDriver {
/**
* @param args
* @throws NoSuchFieldException
* @throws SecurityException
* @throws IllegalAccessException
* @throws IllegalArgumentException
* @throws ClassNotFoundException
*/
public static void main(String[] args) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException, ClassNotFoundException {
Class.forName("com.mysql.jdbc.Driver");
Field field = ClassLoader.class.getDeclaredField("classes");
field.setAccessible(true);//ÉèÖøóÉÔ±±äÁ¿Îª¿É·ÃÎÊ
System.out.println(field.get(ClassLoader.getSystemClassLoader()));
}
}

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package quiz;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* JavaÕýÔò±í´ïʽʾÀý
* */
public class RegularExpressionPattern {
public static void main(String[] args) {
//1.²ÉÓÃPattern.LITERALģʽ,
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