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  1. import java.util.LinkedList;
  2. import java.util.ListIterator;
  3.  
  4. public class Main {
  5. 		public static void main(String[] args) {
  6. 			final LinkedList<String> list = new LinkedList<String> ();
  7.  
  8. 			list.add ("1"); list.add ("2"); list.add ("3"); list.add ("4");
  9.  
  10. 			final MyIterator<String> it = new MyIterator (list.listIterator());
  11.  
  12. 			System.out.println(it.next());
  13. 			System.out.println(it.next ());
  14. 			System.out.println(it.next ());
  15. 			System.out.println(it.previous ());
  16. 			System.out.println(it.previous ());
  17. 			System.out.println(it.next ());
  18. 		}
  19.  
  20. 		public static class MyIterator<T> {
  21.  
  22. 			private final ListIterator<T> listIterator;
  23.  
  24. 			private boolean nextWasCalled = false;
  25. 			private boolean previousWasCalled = false;
  26.  
  27. 			public MyIterator(ListIterator<T> listIterator) {
  28. 				this.listIterator = listIterator;
  29. 			}
  30.  
  31. 			public T next() {
  32. 				nextWasCalled = true;
  33. 				if (previousWasCalled) {
  34. 					previousWasCalled = false;
  35. 					listIterator.next ();
  36. 				}
  37. 				return listIterator.next ();
  38. 			}
  39.  
  40. 			public T previous() {
  41. 				if (nextWasCalled) {
  42. 					listIterator.previous();
  43. 					nextWasCalled = false;
  44. 				}
  45. 				previousWasCalled = true;
  46. 				return listIterator.previous();
  47. 			}
  48.  
  49. 		}	
  50. 	}
  51.  
Success #stdin #stdout 0.07s 215552KB
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https://ideone.com/nO3Rmh
language:
Java (12.0.1)
created:
12 years ago
visibility:
public

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