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Java: Non-static nested classes and instance.super()
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how to restrict protected method access to only subclasses
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How do I dynamically invoke a class method in PHP?
134509
When do you need to explicitly call a superclass constructor?
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How to determine an object's class?
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Objective-C: How do you access parent properties from subclasses?
101449
Using methods from another class in the main?
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When to use abstract classes?
24560
Python: Correct way to initialize when superclasses accept different arguments?
99307
How can I safely (and easily) count *all* instances of a class within my program?
1477
Using property() on classmethods
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In Java, how do I call a base class's method from the overriding method in a derived class?
132039
how to set compile time validation on class instance members
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Calling a class defined from another module