How can you use the methods of the Class object (obtained via a reference) to inspect and manipulate the runtime behavior of objects?

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what is reference variable in java Informational

• What is the Visitor design pattern and how does it use reference variables to allow you to add new operations to a hierarchy of objects without modifying the objects themselves?
• Explain the Observer design pattern in detail and how reference variables are used to maintain the relationship between subjects and observers.
• Why is programming to an interface (using interface reference variables) generally preferred over programming to a concrete implementation (using concrete class reference variables)?
• Can you have an array of reference variables that initially don't point to any objects?
• How do these special types of reference variables differ from strong references (regular reference variables)?
• Can you have a reference to a primitive type in Java? Why or why not?
• How do reference variables facilitate dependency injection, a key aspect of achieving loose coupling?
• What happens to the object that the reference variable was previously pointing to when it's reassigned?
• How do reference variables work in the context of graphical user interfaces (GUIs) in Java (e.g., Swing, JavaFX)?
• How can you check the runtime type of an object referenced by a reference variable in Java?