# Pass by value vs Pass by reference

* Java is pass by value
  * But objects are assigned to variables by their reference
  * primitives use their values

## What is Pass by value

## What is Pass by reference

## Benefits of pass by reference

* There is no copy of the argument made, hence, it is fast.
* To avoid changes done unintentionally we can even make it pass by const reference.
* We can return multiple values from a function.
* Since arguments are not copied into the new variables, it provides greater time and space efficiency
* Runtime polymorphism can be achieved
* Reduction of Memory
  * With passing it as value, function copies 1GB of data that’s passed to it. In total, your program consumes 2 Giga bytes of memory.
  * With passing it as a reference, function instead of copying the data directly access the existing data 1GB. The data alteration by function can be secured by applying “const” to the reference parameter in the function.

## Disadvantages of pass by reference

* As using a reference, you can alter the underlying object state (if the object is mutatble, ie List)
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## Benefits of pass by value

## Disadvantages of pass by value