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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone {
  9.  
  10. 	private PriorityQueue<Node<Integer>> maxPriorityQueue;
  11.  
  12. 	// this will fail to compile because fo bounds (non implementing Compatable)
  13. 	//private PriorityQueue<NonComparable> ncPriorityQueue;
  14.  
  15. 	public static void main (String[] args) throws java.lang.Exception	{
  16.  
  17. 	}
  18.  
  19. 	public Ideone() {
  20. 		maxPriorityQueue = new PriorityQueue<>();
  21. 		Node<String> sNode = new Node<>("test");
  22. 		Node<Integer> iNode = new Node<>(7);
  23. 		maxPriorityQueue.add(iNode);
  24. 		//this will fail to compile because of node type parameter
  25. 		//maxPriorityQueue.add(sNode);
  26. 	}
  27. }
  28.  
  29.  
  30. class NonComparable {}
  31.  
  32. class Node<T> implements Comparable<Node<T>> {
  33.  
  34.     private T info;
  35.     private Node next;
  36.     private Node previous;
  37.  
  38. 	public Node(T payload) {
  39. 		info = payload;
  40. 	}
  41.  
  42. 	public int compareTo(Node<T> other) {
  43. 		return 0;
  44. 	}
  45. }
  46.  
  47. class PriorityQueue<Item extends Comparable<Item>> implements Iterable<Item> {
  48.  
  49. 	private List<Item> list = new ArrayList<>();
  50.  
  51. 	public Iterator<Item> iterator() {
  52. 		return null;
  53. 	}
  54.  
  55. 	public void add(Item item) {
  56. 		list.add(item);
  57. 	}
  58.  
  59. }
Success #stdin #stdout 0.1s 320512KB
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https://ideone.com/GBnHp7
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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