📤 Call by Value (Java uses this)
When a method is called, a copy of the variable’s value is passed. So, any changes made inside the method do not affect the original variable.
Example:
Even though x was changed inside the method, the original variable a remains unchanged.
🔁 Call by Reference (Java mimics this with objects)
Here, a reference (or address) to the actual variable is passed, so changes made inside the method do affect the original object.
Example:
The array’s first element changed! That’s because the method worked on the actual array through its reference.
🧠 Quick Summary:
- Call by value: You give someone a copy of your house key (primitives).
- Call by reference: You give someone the actual key (objects).
