3. Annotation实验类
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　　package chb.test.annotation;
　　@MyAnnotation1("this is annotation1")
　　public class AnnotationDemo {
　　@MyAnnotation2(description="this is annotation2",isAnnotation=true)
　　public void sayHello(){
　　System.out.println("hello world!");
　　}
　　}
　　package chb.test.annotation;
　　@MyAnnotation1("this is annotation1")
　　public class AnnotationDemo {
　　@MyAnnotation2(description="this is annotation2",isAnnotation=true)
　　public void sayHello(){
　　System.out.println("hello world!");
　　}
　　}
　　4.Annotation测试说明类
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　　package chb.test.annotation;
　　import java.lang.reflect.Method;
　　import org.junit.Test;
　　public class TestAnnotation {
　　@Test
　　public void test() throws ClassNotFoundException, SecurityException, NoSuchMethodException{
　　Class cls = Class.forName("chb.test.annotation.AnnotationDemo");
　　boolean flag = cls.isAnnotationPresent(MyAnnotation1.class);
　　if(flag){
　　System.out.println("判断类是annotation");
　　MyAnnotation1 annotation1 = cls.getAnnotation(MyAnnotation1.class);
　　System.out.println(annotation1.value());
　　}
　　Method method = cls.getMethod("sayHello");
　　flag = method.isAnnotationPresent(MyAnnotation2.class) ;
　　if(flag){
　　System.out.println("判断方法也是annotation");
　　MyAnnotation2 annotation2 = method.getAnnotation(MyAnnotation2.class);
　　System.out.println(annotation2.description()+"\t"+annotation2.isAnnotation());
　　}
　　}
　　}
　　package chb.test.annotation;
　　import java.lang.reflect.Method;
　　import org.junit.Test;
　　public class TestAnnotation {
　　@Test
　　public void test() throws ClassNotFoundException, SecurityException, NoSuchMethodException{
　　Class cls = Class.forName("chb.test.annotation.AnnotationDemo");
　　boolean flag = cls.isAnnotationPresent(MyAnnotation1.class);
　　if(flag){
　　System.out.println("判断类是annotation");