Determine class dependencies

Hi,
I was curious if anyone has or knows of a way to determine the dependencies for a given class. For example...
Example
package people;
import java.util.List;
import pet.*;
public class Bob {
     Pet[] pets;
     List todoList;
    // ...other code here
package pets;
import cool.stuff.*;
public class Pet {
     private String name;
     // ....other code here
}Ok, so in this case if I want to know what dependencies the "Bob" class has I can easily look at the import statements and see Bob needs java.util.List and all classes in the "pets" package.
What i am interested in is gathering a list of classes needed by "Bob" inclusive. So in this case it would be something like...
Bob needs...
pets.*
Pet needs...
cool.stuff.*
so the list would include, people\Bob.java, pets\Pet.java (because the pets package in my case only contains one class, and all classes in cool\stuff.
So how can I get this list? I saw a class in the Ant API called DependencyAnalyzer which may work for this...but I have no clue how to use it ( i am still looking for an example of where / how it is used).
Thanks.

Hi,
I was curious if anyone has or knows of a way to
to determine the dependencies for a given class.You would obviously need some tool to do that. I guess you have done some research as you've found the Ant task mentioned, but I don't know that you really have researched.
http://www.google.com/search?hl=en&q=Java+dependency+analyze
Seems there are some tools out there. The only thing I would add is that you really can't be 100% sure that any tool will be totally accurate. They would pretty much have to run your code and have 100% code coverage executed to tell what all the dependencies are. Most code is never totally covered, as there are exception conditions which may never be met, for example.

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Thank you
I understood my problem. When I determine depreciation area in Asset Class. It notice error:
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Hello all
First, sorry if I'm duplicating an already answered question. I didn't searched very deep.
Initial position:
I have 2 Object (A1 and A2) which share the most (about 90%) of their instance variables an the associated methods. The values of the instance variables are retrieved in the real implementation from a stream. Depending of the data of the stream, I have to instantiate either a A1 or A2 object.
A test implementation (using an int in case of the stream):
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package aaa;
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Questions:
What would be a better way to encapsulate the logic into their respective objects ? Is there a way to let the super class A itself identify the type of the object and then extend from A to either A1 or A2 ?
Thanks in advance
Andreas

Hello jduprez
First, I would thank you very much for taking the time reviewing my problem.
Just for the record: have you considered regular serialization? If you control the software at both ends of the stream, you could rely on standard serialization mechanism to marshall the objects and unmarshall them automatically.In my case, I can't control the other site of the stream. At the end, the data comes from a FileInputStream and there aren't objects on the other site, only pur binary data.
- It seems you have one such factory class. Then you already have encapsulated the "determine class" logic, you don't need to add such logic in superclass A.I thought from an OO view, that the super class A is responsible of doing that, but that's where the problem starts. So at the end, it's better doing it in the factory class.
- A itself encapsulates the logic to load its own values from the stream.
- A1 and A2 can encapsulate the logic to load their own specific value from a stream (after the superclass' code has loaded the superclass' attributes values).
My advise would be along the lines of:
public class A {
.... // member variables
public void load(InputStream is) {
... // assign values to A's member variables
// from what is read from the stream.
public class A1 extends A {
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a.load(is);
}The example above assumes you have control over the layout of the data in the stream (here for a given A instance, the attributes defined in A are read first, then come the subclass-specific attributes.
The outcome is: you don't have to create a new A( ) to later create another instance, of a subclass.I like the idea. In the AFactory, is the "A instance;" read as "A a;" ?
Is there a way to let the super class A itself identify the type of the object and then extend from A to either A1 or A2 ?Note I initially read this question as "can an instance of a class mutate into another class", to which the answer is no (an object has one single, immutable class; it is an instance of this class, and of any superclass and superinterface, but won't change its class at runtime).Yes, I have been thinking about a way for mutating into a subclass to keep the already initialized values from the A class without copying or parsing again. But preventing an instance of an A class will be my way. So, in this aspect, Java didn't changed in the last 10 years... It's a long time ago I've used Java for some real projects.
You can, however, create an instance of another class, that copies the values off a priori A instance. Your example code was one way, another way could be to have a "copy constructor":
public class A {
public A(A model) {
this.att1 = model.att1;
this.att2 = model.att2;
public class A1 {
public A1(A model) {
super(model);
... // do whatever A1-specific business
)Still, I prefer my former solution less disturbing: I find the temporary A instance redundant and awkward.Nice to know. I prefer the first solution too.
Thank you again for the help and advices. My mind is searching sometimes for strange solutions, where the real is so close ;-)
Andreas

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