Can a reference variable of a subclass type refer to an object of a superclass type?

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what is reference variable in java Informational

• How do reference variables facilitate dependency injection, a key aspect of achieving loose coupling?
• If a reference variable is final, can the object it points to still be modified?
• Avoid unnecessary creation of temporary objects and reference variables.
• Are wrapper class objects mutable or immutable?
• What are fluent interfaces and how do they often utilize method chaining and reference variables?
• Consider using Optional to represent potentially absent values instead of relying solely on null references.
• What are the implications of a reference variable being null?
• When you serialize an object, are the objects it refers to also serialized?
• What is the meaning of declaring a reference variable as final?
• When you call multiple methods on the same object in a chain, are you working with the same reference or different references?