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syntax - What does Class lt;? gt; mean in Java? - Stack Overflow 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
The difference between Classes, Objects, and Instances The class House describes the concept of what a house is, and there are specific, concrete houses which are objects and instances of class House Note: This is exactly the same in Java as in all object oriented programming languages
Cannot be cast to class - they are in unnamed module of loader app In my case, there are 2 similar classes in the test app modules of my project, and it was trying to cast MyClass from the app module to the MyClass from the test one Since the app had been updated recently, I got to transfer the MyClass changes into the test module, and now it works! @Holger @orirab, thanks for your hints! :)
What does Could not find or load main class mean? The Main class could not be found when there is a typo or wrong syntax in the fully qualified class name or it does not exist in the provided classpath The Main class could not be loaded when the class cannot be initiated
What is the best way of implementing a singleton in Python? Logger in the code above will be of type class 'your_module Singleton', just as the (only) instance of Logger will be of type class 'your_module Logger' When you call logger with Logger(), Python first asks the metaclass of Logger, Singleton, what to do, allowing instance creation to be pre-empted
Convert . class to . java - Stack Overflow 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 (i e , do the reverse of javac) you will have to use proper
class - Understanding Python super () with __init__ () methods - Stack . . . 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?