Sort a table for several classes

**New ID** · 13-02-2010

Hello,
I have a question for you guys
Given that:
- I have two classes A and B, which implements C.
- I have my List of object C.
- I would classify: the first B then the A's.
How this is possible, I need an explanation to this. If you know this or you can explain me this then it will be great.

**TechGate** · 13-02-2010

Hey,
I am new to this concept but I think I have a code it will make understand you the concept, that what exactly happens here.

Code:

 
Public interface C {
 
}
 
Public class Has {
 
}
 
Public class B {
   List <C> list
}
 
Public class D {
   private B root;
}

I hope I am correct here.

**Linux-Us** · 13-02-2010

Hello,
The Class class provides a method to find the class name of an object: Class.getName (). And to find the class of an object, use the method getClass () of the Object class.
In your case,

Code:

int i; / / position in the ls
if(ls.get(i).getClass().getName() == "package.A"){
     / / class A shares for
}else if(ls.get(i).getClass().getName() == "package.B"){
     / / Class B shares for
}

Then for sorting, you can for example create two tables, one contains the objects A, the other objects B. By browsing through the list you store objects in the appropriate table. After that, you have to empty the list and fill in the table object B first, then with the table of objects A.

**SoftWore** · 13-02-2010

Hello,
Look at the following line in your statement, I think you can replace this with a better method than this

Code:

if(ls.get(i).getClass().getName() == "package.A")

And now look at this method, I feel this is better and much more productive than the above.

Code:

if(ls.get(i).getClass() == A.class)

Hope this will help you and you understand the concept behind this.

**InterNetWorKed** · 13-02-2010

Hello,
For your problem requires that C implements Comparable to use the lot later, it must be a class not an interface. Then A and B must inherit from C instead of implementing the coup. In your method compareTo in C returns that you think should be that your objects are Class A or B. I think this should solve your problem and your program should compile successfully.

**NetworkeR** · 13-02-2010

Hello,
I have modified your code, Have a look at it.

Code:

int i; / / position in the ls
if(ls.get(i).getClass().getnm() == "pack.A"){
     / / class A shares for
}else if(ls.get(i).getClass().getnm() == "pack.B"){
     / / Class B shares for
}