How to find Object type.

[Amit Wadhwaa]

Basic Qs: How to find the actual concrete class of an object?

Problem: I have this thousands of line of code and there's this object and I want to debug one of its methods. The problem is the whole code uses factory pattern and it's becoming very hard for me to find the actual class of the object.

The code is something like
a.callMethodWhichIWantToDebug();


Few lines before that we have something like a=getA();
getA(){
B b=getC().createB();
a=getC().getA(b)
return a;
}
getC()
{
D d=getE().getD();
...
and soon

Ofcourse D, E,B are all interfaces.


Is there a easier way to find the implementation class of the object

I cannot use a debugger as I have to deploy the program on a server (it doesnt take long though)to run it.
And hence setting up a debugger would take up some time(stubs/skeletons for code)

[Ernest Friedman-Hill]

You can call getClass() on any object, which returns java.lang.Class. Then use, e.g., Class.getName() to get the name of the class.

[Chandra Bhatt]

Hi Amit,

I have a little idea; you can play with it:

package extra;
 
interface X{}
interface Y{}
interface Z{}
    
class A{
    
}
class B extends A {
    
}
class C extends B implements X,Y,Z{
    
}
 
public class ObjectType {
    
    /** Creates a new instance of ObjectType */
    public ObjectType() {
    }
 
    public static void main(String... args) {
        A a1 = new C();
        Class[] inter = a1.getClass().getInterfaces();
        
        for(int i=0; i<inter.length; i++) {
            System.out.println(inter[i]);
        }
       
        Object o1 = a1;
        System.out.println(o1.getClass().getSuperclass());
        ...
        ...
       
    }
}
 

Perhaps this could solve your problem!



Regards,
cmbhatt