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When a Java program is executed, one or more class loaders locate and load all the classes ... to its parent class loader, the extension class loader. Aside from loading classes from the classpath ...
Imagine you are an expert object-oriented Java developer who ... Marking a class as final prevents all inheritance, by anyone -- even the original developer cannot inherit from one of their own final ...
Java's default constructor ... constructor of its parent class. For more meaningful initializations of variables, you can provide a no-argument constructor of your own and override the default ...