reflection « primitive « Java Data Type Q&A

1. Dynamically find the class that represents a primitive Java type

I need to make some reflective method calls in Java. Those calls will include methods that have arguments that are primitive types (int, double, etc.). The way to specify such types ...

2. Determining if an Object is of primitive type

I have an Object[] array, and I am trying to find the ones that are primitives. I've tried to use Class.isPrimitive(), but it seems I'm doing something wrong:

int i = 3;
Object ...

3. Getting default value for java primitive types

I have a java primitive type at hand:

Class c = int.class; // or long.class, or boolean.class
I'd like to get a 'default value' for this class - specifically the value is assigned ...

4. How to use getMethod() with primitive types?

This is the class:

class Foo {
  public void bar(int a, Object b) {
Now I'm trying to get "reflect" this method from the class:
Class c = Foo.class;
Class[] types = ...

5. Java reflection & isInstance on primitives

I must be missing something here, but I seem to be having some trouble doing some basic reflection. I thought that due to things like boxing that I would receive ...

6. Javassist - How can I get class of primitive types?

In my program, I deal with classes and primitive types. If the program finds a class, it simply does one of the following calls :

  • Class.forName(classname)
  • cc.toClass() where cc is an instance of CtClass
However, ...

7. java primitive data type

I am creating a criteria query from a java object using reflection. The function is as follows

     private void createCriteria(Class searchClass, Object object, Criteria criteria, Field field, ...

10. Reflection using Primitive types

11. Method call with reflection and primitive types - Problem!

With AspectJ I could easily use thisJoinPointStaticPart.getSignature().getName() to get the name of the method. For the array of Class objects I used thisJoinPoint.getArgs() and from each argument the method received I saved the class of that object in an array. But the problem lies there. Because the arguments are primitive it wraps them in their class wrapper. Like java.lang.Float.