how JVM does memory management(or efficiently use memory) for the interface references?

Question

we always use this code

List mylist=new ArrayList();

I look this statement into deep and i found that mylist is an interface reference which is referring to the ArrayList which is a class.I found(on internet) that there is some benefits of it like Loose coupling ,memory management etc.But How ?what are the benefits of using interface refernce?

Several well documented reasons, but memory management most definitely is not one of them. You might be confusing interfaces with soft / weak references there. — Gimby, Feb 10 '16 at 12:41
could you explain the benefits of interface type references for ArrayList object ? What are the benefits or it is just a convention? — Deepak Sharma, Feb 10 '16 at 12:46

score 1 · Accepted Answer · answered Feb 10 '16 at 12:46

1

There is no memory management benefits.

However, using the interface Type allows you to make use of polymorphism. Here, it means you can use any class inheriting List as a working implementation replacement.

This is allowing loose coupling because you are not tied with ONE and ONLY list implementation.

https://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html

https://docs.oracle.com/javase/tutorial/java/concepts/interface.html

answered Feb 10 '16 at 12:46

Hello_world

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i had seen the link but it just only tell about the Interface .I have still some doubt why we are using the Interface reference? – Deepak Sharma Feb 10 '16 at 13:06

how JVM does memory management(or efficiently use memory) for the interface references?

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