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Java5ÖÐÌṩÁËеÄ×¢ÊÍ£¨Annotation£©£¬Äܹ»ÎªÀàÌṩ¶îÍâÐÅÏ¢£¬±¾ÎĽéÉÜÁËÈçºÎ¶¨Òå×¢ÊÍ¡¢ÈçºÎʹÓÃ×¢ÊͺÍÈçºÎ½âÎö×¢ÊÍ¡£
1¡¢¶¨Òå×¢ÊÍ
package ch5;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
// ×¢ÊÍʲôʱºòÆð×÷ÓðüÀ¨Á½ÖÖ£ºRetentionPolicy.RUNTIME£¨±àÒë²¢ÇÒÔÚÔËÐеÄʱºò¿ÉÒÔÕÒµ½£©£¬
// RetentionPolicy.SOURCE£¨±àÒëµÄʱºò½«±»ºöÂÔ£©
@Retention(RetentionPolicy.RUNTIME)
// TargetÖ¸³ö×¢ÊÍʹÓõĵط½£ºÀà»òÕß½Ó¿ÚÉÏ£¨ElementType.TYPE£©£¬
// ·½·¨ÉÏ(ElementType.METHOD)£¬
// ÊôÐÔÉÏ(ElementType.FIELD)
@Target({ElementType.TYPE})
public @interface Table {
 String name();
}
2¡¢Ê¹ÓÃ×¢ÊÍ
package ch5;
@Table(name = "user")
public class UserBean {
 private String id;
 private String name;
}
3¡¢½âÎö×¢ÊÍ
package ch5;
import java.lang.annotation.Annotation;
public class UserManger {
 private UserBean user;
 public static void main(String[] args) {
  System.out.println(new UserManger().getTable());
 }
 
 /*
  * »ñȡעÊÍÐÅÏ¢
  */
 public String getTable(){
  // µÃµ½ËùÓÐ×¢ÊÍ
  Annotation[] annotations = UserBean.class.getAnnotations();
  // ±éÀú
  for(Annotation annotation:annotations){
   // ¿´¿´ÊÇ·ñÓÐÌØ¶¨µÄ×¢ÊÍ
   if(annotation instanceof Table){
    return ((Table) annotation).name();
   }
  }
  return null;
 }
}
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