Identify who am I ?

I am compiled from a .java file.   : class
My instance variable values can be different from my buddy’s values. : object
I behave like a template. : class
I like to do stuff. : object, method
I can have many methods. : class,object
I represent ‘state’. : instance variable
I have behaviors. : object,class
I am located in objects. : method, instance variable
I live on the heap.  : object
I am used to create object instances. : class
My state can change.: object,instance variable
I declare methods. : class
I can change at runtime. : object, instance variable