Looks like you're pretty much there!
I've had a lot of difficulties with this homework too.
Here's what I've finished up with:
Note: I could not get it to work with the travelThroughTime method taking no
parameters, that is: travelThroughTime(), so used travelThroughTime(String
s) instead.
Output:
Method travelThroughTime has 2 annotations
Annotation 0: @RequestForEnhancement(engineer=Mr. Peabody, date=14/1/3007,
id=2868724, synopsis=Enable time-travel), Type: RequestForEnhancement
Method travelThroughTime has an annotation of type RequestForEnhancement
id: 2868724
date: 14/1/3007
engineer: Mr. Peabody
synopsis: Enable time-travel
Annotation 1: @Name(first=Earnest, last=Peabody), Type: Name
AnnotatedClass.java:
@RequestForEnhancement(
id = 2868724,
synopsis = "Enable time-travel",
engineer = "Mr. Peabody",
date = "14/1/3007"
)
@Name(
first = "Earnest",
last = "Peabody"
)
public void travelThroughTime(String s) {
System.out.println("travelthroughTime Method");
}
RuntimeAnnotation.java:
// Get specific Method
try{
//Method method = c.getMethod("travelThroughTime", null);
//Method method = c.getMethod("travelThroughTime", (Class)null);
Method method = c.getMethod("travelThroughTime", new
Class[]{String.class}); // obtain method object
// Get specific annotation for a method
//Annotation annotation =
method.getAnnotation(RequestForEnhancement.class);
// Get all annotations for a method
Annotation[] annotations2 = method.getDeclaredAnnotations();
int numberOfAnnotations2 = annotations2.length;
System.out.println("Method " + method.getName() + " has " +
numberOfAnnotations2 + " annotations");
for (int i = 0 ; i < numberOfAnnotations2; i++) {
System.out.println("Annotation " + i + ": " + annotations2[i] +
", Type: " + annotations2[i].annotationType().getName());
if(annotations2[i] instanceof RequestForEnhancement){
System.out.println("Method " + method.getName() + " has an
annotation of type " + annotations2[i].annotationType().getName());
RequestForEnhancement myAnnotation = (RequestForEnhancement)
annotations2[i];
System.out.println("id: " + myAnnotation.id());
System.out.println("date: " + myAnnotation.date());
System.out.println("engineer: " + myAnnotation.engineer());
System.out.println("synopsis: " + myAnnotation.synopsis());
}
}
} catch(Exception e){
System.out.printf("Caught runtime exception = %s", e);
}
Regards,
Mark
-----Original Message-----
From: papatya [mailto:[email protected]]
Sent: Wednesday, 18 November 2009 7:39 AM
To: Java Programming Online Training Course By Sang Shin
Subject: [java programming] Re: lab 1107-annotation
OK FORGET First one please
this is the situation that i am in.
output:
Class MyOwnAnnotationProject has 1 declaredAnnotations
Annotation 0: @RequestForEnhancement(engineer=Ms. Eagle,
date=03/03/2009, id=55, synopsis=sum), typeRequestForEnhancement
Class MyOwnAnnotationProject has 0 declaredAnnotations
Class MyOwnAnnotationProject has 0 declaredAnnotations
is it ok?
____________________________________________________________________________
__________________________
import java.lang.annotation.*;
import java.lang.reflect.*;
public class MyOwnAnnotationProject {
public MyOwnAnnotationProject() {
}
@RequestForEnhancement(id = 55,
synopsis = "sum",
engineer = "Ms. Eagle",
date = "03/03/2009")
public void printAnnotations() {
Class c = this.getClass();
Method[] m = c.getDeclaredMethods();
for (int i = 0; i<m.length; i++){
Annotation[] declaredAnnotations = m
[i].getDeclaredAnnotations();
int numberDeclaredAnnotations = declaredAnnotations.length;
System.out.println("Class " + c.getName() + " has " +
numberDeclaredAnnotations + " declaredAnnotations");
for (int j = 0 ; j < numberDeclaredAnnotations; j++) {
System.out.println("Annotation " + j + ": "+
declaredAnnotations[j] + ", type" + declaredAnnotations
[j].annotationType().getName().toString());
}
}
}
public static void main(String[] args) {
MyOwnAnnotationProject ar = new MyOwnAnnotationProject();
ar.printAnnotations();
}
public void addition(){
int i = 2;
int j = 1;
int result=i+j;
}
}
On Nov 17, 10:01 pm, papatya <[email protected]> wrote:
> i read the forum but i mixed evrythg
> i can't find the right output
> hope you to help me
>
> run:
> Class MyOwnAnnotationProject has 0 declaredAnnotations
> BUILD SUCCESSFUL (total time: 0 seconds)
>
> What is wrong with this?
> ______________________________________________________________
> import java.lang.annotation.Annotation;
> import java.lang.reflect.Method;
>
> /**
> *
> * @author ppty
> */
> import java.lang.annotation.*;
> import java.lang.reflect.*;
> public class RunTimeAnnotation {
> MyOwnAnnotationProject ac;
> public RunTimeAnnotation() {
> ac = new MyOwnAnnotationProject ();
> }
> public void printAnnotations() {
> Class c = ac.getClass();
> Method[] m = c.getDeclaredMethods();
>
> for (int i = 0; i<m.length; i++){
> Annotation[] declaredAnnotations = m
> [i].getDeclaredAnnotations();
> int numberDeclaredAnnotations = declaredAnnotations.length;
> System.out.println("Class " + c.getName() + " has " +
> numberDeclaredAnnotations + " declaredAnnotations");
> for (int j = 0 ; j < numberDeclaredAnnotations; j++) {
> System.out.println("Annotation " + j + ": "+
> declaredAnnotations[j] + ", type" + declaredAnnotations
> [j].annotationType().getName().toString());}
> }
> }
>
> public static void main(String[] args) {
> RunTimeAnnotation ar = new RunTimeAnnotation();
> ar.printAnnotations();
> }
>
>
>
> }- Hide quoted text -
>
> - Show quoted text -
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