What are instance reference variables (fields) in Java?
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what is reference variable in java Informational
- Consider using Optional to represent potentially absent values instead of relying solely on null references.
- How can you obtain Class objects using reference variables or class literals?
- Explain the concept of immutability in Scala and how it affects the way you work with reference variables.
- Explain the concept of dangling references (which is not directly applicable in Java but related to the idea of object lifetime).
- How would you explain NullPointerException in the context of reference variables to a beginner?
- Explain the role of reference queues in conjunction with weak, soft, and phantom references for tracking object reachability and cleanup.
- How can you check if a reference variable is null in Java?
- When a lambda expression accesses variables from its enclosing scope, are they accessed by value or by reference?
- 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?
- What is upcasting in Java and how is it related to reference variables?
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