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I want to make LinkedList by Eclipse but i don't know how to make LinkedList. First of all, I want to compare with int's data and reference. but, i don't know how to compare.

package List; public class DoubleLinkedList { CellDouble x; CellDouble head;//List's head public DoubleLinkedList() { //리스트의 헤더를 할당한다. head=new CellDouble(0); head.prev=head.next=head; } public void insertAfter(CellDouble p,int data) { CellDouble x=new CellDouble(data); x.prev=p; x.next=p.next; p.next.prev=x; p.next=x; } public void insertFirst(int data) { //List's next to insert insertAfter(head.next,data); } public void insertLast(int data) { //list's last's next to insert. insertAfter(head.prev,data); } public void removeCell(CellDouble p) { p.prev.next=p.next; p.next.prev=p.prev; } public Object removeFirst() { if(isEmpty()) { return null; } CellDouble cell=head.next; removeCell(cell); return cell.data; } public Object removeLast() { // 요소가 없다면 null 반환 if(isEmpty()) { return null; } CellDouble cell=head.prev; removeCell(cell); return cell.data; } public boolean isEmpty() { return head.next==head; } public void FindNumber(int data) { if(x==null) { insertFirst(data); } else if(x.data<data) { insertAfter(x,data); } } public void Findnumber(int data) { if(x.data==data) { removeCell(x); } else if(x.data!=data) { System.out.println("like this number is nothing"); } } }

And, I finished my programming. but, its outcome 'List.DoubleLinkedList@8c1dd9'

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  • Do you checked this? docs.oracle.com/javase/7/docs/api/java/util/LinkedList.html Commented May 28, 2012 at 13:17
  • this is just outputting the LinkedList that you have created , what exactly are you expecting as the output ? Commented May 28, 2012 at 13:18
  • As your code stands, it wouldn't compile since FindNumber is defined twice. Commented May 28, 2012 at 14:32

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Check my answer here for the basics. The elements of your list must implement Comparable, read more here.

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