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Mar 29, 2012 · Class is a parameterizable class, hence you can use the syntax Class<T> where T is a type. By writing Class<?>, you're declaring a Class object which can be of any type (? is a wildcard). The Class type is a type that contains meta-information about a class. It's always good practice to refer to a generic type by specifying his specific type, by using Class<?> you're respecting this practice ...

Feb 26, 2013 · What does .class mean in Java? For example, if I created a class called Print. What does Print.class return?

Aug 1, 2009 · A class is a blueprint which you use to create objects. An object is an instance of a class - it's a concrete 'thing' that you made using a specific class. So, 'object' and 'instance' are the same thing, but the word 'instance' indicates the relationship of an object to its class. This is easy to understand if you look at an example. For example, suppose you have a class House. Your own house ...

Feb 23, 2009 · next_class.__init__(self) break If we didn't have the super object, we'd have to write this manual code everywhere (or recreate it!) to ensure that we call the proper next method in the Method Resolution Order! How does super do this in Python 3 without being told explicitly which class and instance from the method it was called from?

Dec 16, 2009 · When inheriting an abstract class, a concrete child class must define the abstract methods, whereas an abstract class can extend another abstract class and abstract methods from the parent class don't have to be defined. Similarly, an interface extending another interface is not responsible for implementing methods from the parent interface.

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ISO C++ forbids in-class initialization of non-const static members. You can only do that for integral const static members, and that's because static const integral variables won't be actually put in memory, but will be used as constant at compile time.

typename and class are interchangeable in the basic case of specifying a template: template<class T> class Foo { }; and template<typename T> class Foo { }; are equivalent. Having said that, there are specific cases where there is a difference between typename and class. The first one is in the case of dependent types. typename is used to declare when you are referencing a nested type that ...

Jun 3, 2011 · Invoking javap to read the bytecode The javap command takes class-names without the .class extension. Try javap -c ClassName Converting .class files back to .java files javap will however not give you the implementations of the methods in java-syntax. It will at most give it to you in JVM bytecode format. To actually decompile …