Mega Code Archive
0125 Obtaining All Annotations
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You can obtain all annotations that have RUNTIME retention that are associated with an item by calling getAnnotations( ) on that item. It has this general form:
Annotation[ ] getAnnotations( )
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;
@Retention(RetentionPolicy.RUNTIME)
@interface MyAnno {
String str();
int val();
}
@Retention(RetentionPolicy.RUNTIME)
@interface What {
String description();
}
@What(description = "An annotation")
@MyAnno(str = "Meta2", val = 99)
public class Main {
@What(description = "test method")
@MyAnno(str = "Testing", val = 100)
public static void myMeth() throws Exception {
Main ob = new Main();
Annotation annos[] = ob.getClass().getAnnotations();
System.out.println("All annotations for Meta2:");
for (Annotation a : annos) {
System.out.println(a);
}
Method m = ob.getClass().getMethod("myMeth");
annos = m.getAnnotations();
for (Annotation a : annos) {
System.out.println(a);
}
}
public static void main(String args[]) throws Exception {
myMeth();
}
}
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