jdk 5.0 Annotation Test Code

자바 5.0의 Annotation에 대한 샘플 예제를 만들어 보았다.

 

import java.lang.annotation.*;
import java.lang.reflect.*;
import java.util.*;

@Retention(RetentionPolicy.RUNTIME)
@interface Title {
    String value();
}
public class AnnotationTest {

    public enum DescEnum {  @Title("1") X1,  X2 , X3 };
    public static EnumSet<DescEnum> de = EnumSet.of(DescEnum.X1, DescEnum.X2);

    public static void main(String[] args) {
        AnnotationTest mt = new AnnotationTest();
        ///////////////////////////////////////////////////////////////
        // EnumSet
        ///////////////////////////////////////////////////////////////

        try {
            Field field = mt.getClass().getField("de");
            System.out.println(field.getGenericType()) ;
            ParameterizedType tv = (ParameterizedType) field.getGenericType();
            System.out.println(tv);
            System.out.println("rawtype : " + tv.getRawType());
            System.out.println("getOwnerType : " + tv.getOwnerType());
            System.out.println("getReal : " + tv.getActualTypeArguments());

            for (Type t : tv.getActualTypeArguments()) {
                System.out.println("t : " + t);
                //System.out.println("class name: " + c.getName());
                Field[] enumFields = ((Class)t).getFields();
                for (Field f : enumFields) {
                    System.out.println("enum element name : " + f.getName());
                }
            }

            Iterator iter = de.iterator();
            while(iter.hasNext()) {
                System.out.println(iter.next());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 

실행결과

 

$ java AnnotationTest
java.util.EnumSet<AnnotationTest$DescEnum>
java.util.EnumSet<AnnotationTest$DescEnum>
rawtype : class java.util.EnumSet
getOwnerType : null
getReal : [Ljava.lang.reflect.Type;@66848c
t : class AnnotationTest$DescEnum
enum element name : X1
enum element name : X2
enum element name : X3
X1
X2