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  1. class Ideone {
  2. 	private Node head, tail;
  3.  
  4. 	public static void main (String[] args)  {
  5. 		Ideone ideone = new Ideone();
  6.  
  7. 		ideone.add("HOLA");
  8. 		ideone.add("MUNDO");
  9.  
  10. 		System.out.println(ideone);
  11. 	}
  12.  
  13. 	public void add(String element) {     
  14.     	Node node = new Node(element); 
  15.  
  16.     	if (tail == null) {
  17. 	        head = tail = node; 
  18. 	    } else {
  19. 	    	head.previous = node;
  20.         	node.next = head;
  21.         	head = node;
  22.     	}
  23. 	}
  24.  
  25. 	public String toString() {
  26. 		StringBuilder builder = new StringBuilder();
  27.  
  28. 		Node current = head;
  29. 		while(current != null) {
  30. 			builder.append(current.element);
  31. 			current = current.next;
  32. 		}
  33.  
  34. 		return builder.toString();
  35. 	}
  36.  
  37. 	private static class Node {  
  38.         String element;
  39.         Node previous, next;
  40.  
  41.         public Node(String element) {
  42.             this.element = element;
  43.     	}
  44. 	}
  45. }
Success #stdin #stdout 0.06s 380160KB
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MUNDOHOLA
https://ideone.com/evpQ4K
language:
Java (12.0.1)
created:
9 years ago
visibility:
public

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