What is the role of reference variables when working with annotations in Java?
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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?
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