Scenario: You are working on a legacy codebase that uses a mix of primitive types and wrapper classes. How would you decide when to use a primitive type versus a wrapper class? Provide examples.

Expected Answer:

• Use primitive types for performance-critical applications where memory and speed are important (e.g., int, double).
• Use wrapper classes (e.g., Integer, Double) when you need to use collections (e.g., ArrayList), handle null values, or leverage object-oriented features like polymorphism.

Example:

int primitiveInt = 10; // Primitive type
Integer wrapperInt = 10; // Wrapper class