Thread: Method to count objects

Is it possible to write a method that will count the number of object created?

In the past, I have counted objects by declaring a integer count variable and incrementing each time that constructor is called. However, I now want to write a method that will count objects on its own. For instance:

public class MyClass
{
     private int numMyClass;
 
     public int countMyClassObjs
     {
          //Code that counts instances of MyClass
          return numMyClass;
     }
}

If this is just for profiling purposes, try out JVisualVM, comes with the JDK nowadays

// Json

Originally Posted by Json

If this is just for profiling purposes, try out JVisualVM, comes with the JDK nowadays

// Json

I'm not sure I understand what you mean. Could you elaborate?

Well for one, make the method static otherwise the feild "numMyClass" is a new value every instance, and in terms of removing, you need to override the "finalize" method, called by the garbage collector, and use that to decrease the value.

Originally Posted by helloworld922

The easy solution is to override the finalize method and decrease that counter whenever the object actually gets destructed (note: even though an object goes out of scope or has no more references to it, it does not get destructed right away)

But there is no guarantee that an object finalizer will ever be called, so it's not really a reliable solution.