Maximizing code reuse in your Java ... Ensures a class has only one instance and provides global access to it. Factory method: Defines an interface for creating objects, but lets subclasses ...

For example, if we want to write the following class and try to compile ... your inheritance Need to limit the number of possible subclasses in your codebase? Here comes Java's sealed classes to your ...

You can write a simple generic launcher ... Launcher <command>"); } } } // Launcher Java Reflection provides a lot of information about a given class at runtime: you can easily know all its ...