Singleton Pattern Exercise

Objective: Write a class that uses the Singleton pattern.

In this exercise, you will write a Panda class that guarantees exactly one instance can exist during program execution. You may answer in Java or C++.

Requirements

1. Prevent callers from directly constructing Panda (use a non-public constructor).
2. Provide a single access point (for example, getInstance() / instance()) that always returns the same object.
3. Add one simple instance method (for example, speak(), eatBamboo(), or getName()) to show the object is usable.
4. Optional but recommended: make the implementation safe for concurrent access (briefly note what you did).

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