#Java

Differentiate between a shallow copy and a deep copy in Java, explaining how object references are handled in each case.

Explain how parameter passing works in Java and clarify why Java is strictly pass-by-value.

Explain how String immutability works in Java and how it contributes to thread safety.

Given a list of `Bird` objects containing properties `name` and `color`, group the birds by their color.

Where have you used ConcurrentHashMap in your project?