21 lines
757 B
Markdown
Executable File
21 lines
757 B
Markdown
Executable File
## What is an Interface?
|
||
|
||
- An interface is a device or a system that unrelated entities use to interact.
|
||
- A remote control is an interface between you and a television set.
|
||
|
||
basically the interface has and abstract method which classes have to implement the method to make it 'real'.
|
||
|
||
Concert realisation of the otherwise abstract method.
|
||
|
||
## What is a Linked List?
|
||
|
||
- On the linked list every node is an object.
|
||
- Has more memory overhead than an ArrayList.
|
||
- Each node holds both data and the address of next and previous node.
|
||
- It mainly allows efficient *insertion* and *deletion* operations compared to arrays
|
||
- Its dynamic, the size of it changes with every change.
|
||
|
||
# Protected
|
||
|
||
prevents the method to be used by anyone but its sub classes.
|