Unused instance variables in abstract class
49
What is a NullPointerException, and how do I fix it?
36327
Why cast an unused function parameter value to void?
109069
Lazy loading of class attributes
103294
How to implement an abstract class in ruby?
129614
Can we instantiate an abstract class directly?
70195
Can I use Class.newInstance() with constructor arguments?
120547
What are the rules dictating the inheritance of static variables in Java?
150628
point of having an instance variable as final?
85960
Abstract class vs Interface in Java
96066
explicit copy constructor ignored even if exact argument was provided
46182
Is it possible to force the use of "using" for disposable classes?
45243
Does a subclass constructor require all arguments of superclass constructor?
1138
How to avoid having class data shared among instances?
34805
Is it possible to make abstract classes in Python?
124515
Java: Non-static nested classes and instance.super()
89820
Any reason to clean up unused imports in Java, other than reducing clutter?
158670
numpy array subclass unexpedly shares attributes across instances