1:JScrollPane scroll=new JScrollPane
scroll.setPreferredSize(new Dimension(400,300));

Question:here does it means scrollbar(scroll) is at position according to dimension or something different...

2:For difference between DefaultListModel and LinkedList
In DefaultListModel(DM) we dont have function to add element at first position like Linkedlist...but there is one function in DM called
add(int index,Object element)
is that mean we can add element at first position in DM List...
If yes then it seems there is no difference between DM and LinkedList..
then what exactly is difference between linkedlist and defaultlistmodel...please explain clearly....

3:what is \r and \n in Java.....can u give an example..



can u also give example to above all questions....

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#1 --> Need to check in API, I'm too busy. you may want to check the function from API Specifications

#2 --> I think DefaultLinkedList is the Singly Linked List, while LinkedList is the Doubly Linked List. I'm not sure with this though, you probably want to double check on what method does DefaultLinkedList has compared to LinkedList. Can you add DefaultLinkedList from the front AND back? (I never personally used DefaultLinkedList lol.. but I know that you can do this with LinkedList)

Doubly = can add from the front and back nodes
Singly = only from the front

#3 --> \n is newline not sure with \r try to print out something
Test using this code:

And see what happened..

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