What are some common coding idioms and best practices related to the declaration, assignment, and usage of reference variables in Java?

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what is reference variable in java Informational

• How can you use reference variables to implement the Singleton design pattern in Java?
• What is the default value of a reference variable in Java?
• How do reference variables behave differently when dealing with mutable versus immutable objects?
• When does == compare the references and when does it compare the content of the objects?
• Explain the role of reference queues in conjunction with weak, soft, and phantom references for tracking object reachability and cleanup.
• When you declare resources (like streams or database connections) within the try-with-resources statement, are you using reference variables?
• How does autoboxing and unboxing affect the assignment of primitive values to wrapper class reference variables and vice versa?
• What are transient fields and how do they affect serialization of objects and their referenced objects?
• When you create a Socket or ServerSocket object, you assign it to a reference variable. Why?
• When you declare an array of objects, what are you actually creating in terms of reference variables?