Genrate Single LL from Double LL

[SHE]

i created Doubly Linked List with all methods i need , but there is still one question which i really did not understand it very well it said : write a method to create linked list from double linked list using the methods available in myLinkedList(which had the methods that i created), and java.util.LinkedList ?

can any body explain to me this question ?


Look this is my main code , My Double Linked List Methods worked probley with me , but when i created the single LL , that am just imported from lib.
i got an error .. how i can create Single LL with Double LL methods.



public static void main(String[] args) {
DLL dll = new DLL();
LinkedList L1 = new LinkedList();


dll.insertFirst("A");
dll.insertFirst("b");
dll.insertFirst("c");
dll.insertLast(1);
dll.insertLast(3);
dll.insertLast(5);

dll.deleteFirst();
dll.deleteLast();

dll.printFirst();
dll.printLast();


L1.addFirst("I");
L1.addFirst("s");
L1.addFirst("h");
L1.printFirst();

}

[FlipPoker@gmail.com]

The LinkedList class does not have a method called printFirst(). Instead, you can do this:

System.out.println(L1.getFirst());

Look at the Java API when you're using the built-in classes: LinkedList

[SHE]

YUP i know that , but my question is :

write a method to create linked list from double linked list using the methods available in myLinkedList(which had the methods that i created), and java.util.LinkedList ?

so i have write method this first require.
by using methods in DLL and java.util.LinkedList.

i do not have a lot of info about Linked list , but i know that ..
i can create simple linked list without using " .getPrev Node" ..
so the first think i think about it is write this method in the main to create Single Linked List ..

public static LinkedList singLL(LinkedList L1)
{

int a = L1.size();
for(int K =0;K<=a;K++)
{
L1.addFirst("A");
}
System.out.println(L1.getFirst());
return L1;


}


but my problem now is /// how i can use DLL methods for SLL that i ALREADY created !!

[SHE]

I know one solution is "iterate through my doubly-linked list and add each element to a java.util.LinkedList" .. can any one explain how i can iterate my DLL although i created by myself

[SHE]

WHEN I TRY THIS ONE IS STILL DOES NOT WORK IT RETURNED (0) AS OUTPUT

//Iterate with the help of while loop
System.out.println("Iterating with the help of while loop");
int j=0;
while (j< dll.size())
{
L1.addFirst(j);
System.out.println( L1.get(j) );
j++;
}