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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.stream.*;
  5.  
  6. /* Name of the class has to be "Main" only if the class is public. */
  7. class Ideone {
  8.  
  9. 	public static boolean isPalindromeList(LinkedList<Integer> list) {
  10. 	    ListIterator<Integer> forward = list.listIterator(0);
  11. 	    ListIterator<Integer> reverse = list.listIterator(list.size());
  12. 	    while (forward.hasNext()) {
  13. 	        if (!forward.next().equals(reverse.previous())) {
  14. 	            return false;
  15. 	        }
  16. 	    }
  17. 	    return true;
  18. 	}	
  19.  
  20. 	public static void testData(int[] data) {
  21. 		LinkedList<Integer> list = IntStream.of(data).boxed().collect(LinkedList::new, LinkedList::add, LinkedList::addAll);
  22. 		boolean isp = isPalindromeList(list);
  23. 		System.out.println("List " + list + " palindrome "  + isp);
  24. 	}
  25.  
  26. 	public static void main (String[] args) throws java.lang.Exception {
  27. 		testData(new int[]{1, 2, 3, 4, 5, 4, 3, 2, 1});
  28. 		testData(new int[]{1, 2, 4, 5, 4, 3, 2, 1});
  29. 	}
  30. }
Success #stdin #stdout 0.19s 3359744KB
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stdin
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Standard input is empty
stdout
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List [1, 2, 3, 4, 5, 4, 3, 2, 1] palindrome true
List [1, 2, 4, 5, 4, 3, 2, 1] palindrome false
https://ideone.com/LmfQrB
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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