首先聲明壹個接口，並未它添加註解內容！
package testAnnotation;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface Person{
String name();
int age();
}
2、然後利用反射機制查看類的註解內容
package testAnnotation;
@Person(name="xingoo",age=25)
public class test3 {
public static void print(Class c){
System.out.println(c.getName());
//java.lang.Class的getAnnotation方法，如果有註解，則返回註解。否則返回null
Person person = (Person)c.getAnnotation(Person.class);
if(person != null){
System.out.println("name:"+person.name()+" age:"+person.age());
}else{
System.out.println("person unknown!");
}
}
public static void main(String[] args){
test3.print(test3.class);
}
}
運行結果，讀取到了註解的內容
testAnnotation.test3
name:xingoo age:25