Weird Pain In Abdomen At Nite

More Reflection in Java Annotations

Reflection is a Java API which is very useful and is used by many Java frameworks like Spring, Struts or Trapestry, allowing access methods, attributes and see the behavior of a class during program execution.

Reflection can be used to create visual development environments, tools that serve for testing a component, debugging tools (aka debugging) or a framework to create and inject instances of objects properties from a configuration file

So this time I show a class that a colleague made some years ago that lets you create instances and / or access to properties (Via accessor methods) so thoughtful. This is a very useful tool as it allows properties of objects so that we can use it to order more generally beans without having to define a comparator for each bean depending on the property you want to compare, make a list of beans in a map or create lists of any of the properties of the bean.

 
 / * * GenericBean.java 
 
 
 * * Created on June 22, 2006, 09:32 PM 
 
 
 * * / 
 
 / ** 
 * * @ author JM 
 
 * / import 
 java.lang.reflect.Constructor; 
 import java.lang.reflect.Method; 
 
  public class GenericBean { 
  private Object o; 
  private Class beanClass; 
  
  /** Creates a new instance of GenericBean */ 
  public GenericBean(String className) { 
   try { 
    beanClass = Class.forName(className); 
    Constructor c = beanClass.getConstructor(); 
    o = c.newInstance(); 
   } catch (Exception e) { 
    e.printStackTrace(); 
   } 
  } 
  
  public GenericBean(Object instance) { 
   o = instance; 
   beanClass = o.getClass(); 
  } 
  
  public Object get(String property) { 
   Object ret = null; 
   property = property.substring(0, 1).toUpperCase()  
     + property.substring(1); 
   try { 
    String methodName = "get" + property; 
    Method method = beanClass.getMethod(methodName); 
    ret = method.invoke(o); 
   } 
   catch(Exception e) { 
    try { 
     String methodName = "is" + property; 
     Method method = beanClass.getMethod(methodName); 
     ret = method.invoke(o); 
    } 
    catch(Exception ex) { 
     e.printStackTrace(); 
    } 
   }  
    
   return ret; 
  } 
  
  public void set(String property, Object value) { 
   property = property.substring(0, 1).toUpperCase() 
 + Property.substring (1); 
 
 try {Method method = beanClass.getMethod ("set" + property, value 
. GetClass ()); 
 method.invoke (or value); 
} catch (Exception e) 
 {e.printStackTrace ();} 
 
 
 
} public Object getObject () {
 return o;} 
 
 
 GetObjectClass public Class () {return 
 o.getClass (); 
}} 
 
 

Tomorrow write and to use this class, because the truth right now it's a little night lol and now I'm falling asleep. Just as an additional reminder, it is important to remember that use Reflection generates low virtual machine performance and often can not use optimizers are there in the JVM, such as in multiple calls to methods, etc ... tail recursion Greetings


Gus

Tattoo Of Footprint On Leg

Level: Intermediate

annotations in Java, are trademarks that are made part of the program, which have no direct effect on it but they are thoughtful in execution, ie can be used by a container at the time of implementation.


Annotations are a special type of switch and can be used with other modifiers such as public, static, private etc ... Say annotations are one way to implement an interface, without the kind you do directly. For example, you create a Dog class, and then you note to say that is an animal, in this way, in implementing the program using reflection is possible to know that any object of class Dog is an animal. Ie we are saying that dog is an animal and serves a similar function to an interface.

 
 @ Animal 
 
 public class Dog {/ / Some good dog class method} 
 
 

Define an annotation is very simple, it is the same way as an interface and puts a " @ "at the beginning of the word interface, and methods will contain elements of the annotation, and can only return primitive types, String and Enums.

 
 @ interface Animal {public boolean 
 vertebrate ();} 
 
 

With the notation presented above, we score some sort and define whether the animal that we are noting is vertebrate or invertebrate

 
 @ Animal (vertebrate = true) public class Dog {
 
 
} 
 

This will ensure the implementation of the program can tell if an object of class Dog is an animal, and what kind of animal, we can also specify that serves only the annotation to annotate classes, we can not have animal-like methods. To do this we scored our touchdown. Then our notation becomes:

 
 package annotations; 
 import 
 java.lang.annotation.Retention; 
 java.lang.annotation.Target import, import 
 java.lang.annotation.ElementType; 
 import java.lang. annotation.RetentionPolicy; 
 
 
 
 @ Retention (RetentionPolicy.RUNTIME) 
 @ Target (ElementType.TYPE) 
 Animal {public @ interface 
 
 vertebrate boolean ();} 
 
 
 
 

Thus we specify that the scoring only used to define types. Now how to use it in the execution:

 
 
 
 package annotations; 
 
 import java.util.ArrayList; 
 import java.util.List; 
 
 public class Main {
 
 @ SuppressWarnings ("unchecked") public 
 static void main (String [] args) {
 
 / / Create a List List 
 obj = new ArrayList (); 
 
 / / add 2 Dogs 
 obj.add (new Dog ()); 
 obj.add (new Dog ()); 
 
 / / add 1 
 obj.add String ("I am a String"); 
 
 System.out.println ("Number of animals in the list:" + contarAnimales (obj)); 
 
 
 
} public static int contarAnimales (List  o) 
 {if (o == null) return 0 
; 
 
 else {System.out.println ("Starting to count"); 
 int count = 0; 
 for (Object object: o) {
 / / System.out.println (object.getClass (). getAnnotation (Animal.class)); 
 if (object.getClass (). isAnnotationPresent (Animal.class)) {
 count + +; 
} 
} 
 return count; 
} 
} 
 
} 
 
 

Although the example is not the most orthodox, gives an example of what can make annotations, and how is the use frameworks such as JAXB or Spring 2.5 Annotated, which can make Autoalambrado, define driver, mapping request with annotations to avoid having to configure a dispatcher servlet great. Greetings

Accidental Groping Clips

Recruitment Incentives Regarding the Social Security Contribution

Recruitment Incentives Regarding the Social Security Contribution

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TYPE OF CONTRACT 150
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TYPES 410 and 510 CONTRACT (interim contract to full time and part respectively)

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BASE IS CALCULATED AS REGULATOR OF IT.

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