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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. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 	      List list2 = Arrays.asList("1", "2", "3", "4", "5","6","7","8","9","10"); 
  13.           List list3 = Arrays.asList("1", "2", "3", "4", "5","6","7","8","9","10", "11");
  14.  
  15.  
  16.  
  17.           arraysList(list2);          
  18.           linkedList(list2);
  19.  
  20.           arraysList(list3);          
  21.           linkedList(list3);
  22. 	}
  23.  
  24. 	private static void linkedList(List list){
  25.     LinkedList<String> in = new LinkedList<String>(list);
  26.     LinkedList<String> out = new LinkedList<String>();
  27.  
  28.     out.addFirst(in.getFirst());
  29.  
  30.     Iterator<String> it = in.iterator();
  31.     it.next();
  32.  
  33.     Iterator<String> rit = in.descendingIterator();
  34.     rit.next();
  35.  
  36.     int median = in.size() / 2 - 1;
  37.  
  38.     for (int i = 0; i < median; i++) {
  39.         out.add(rit.next());
  40.         out.add(it.next());
  41.     }
  42.  
  43.     if (in.size() % 2 == 1) {
  44.         out.addLast(it.next());
  45.     }
  46.  
  47.     out.addLast(in.getLast());
  48.     System.out.println("LinkedList: "+out + ".size("+out.size()+")");
  49. }
  50.  
  51.     private static void arraysList(List list) {
  52.         ArrayList<String> in  = new ArrayList<String>(list);
  53.         ArrayList<String> out = new ArrayList<String>(in.size()); 
  54.  
  55.         out.add(in.get(0));
  56.         int last = in.size() - 1;
  57.  
  58.         int median =  in.size() / 2 ;
  59.         for (int i = 1; i < median ; i++) {
  60.             String r = in.get(in.size() - i - 1);
  61.             String l = in.get(i);
  62.             out.add(r);
  63.             out.add(l);
  64.         }
  65.  
  66.         if (in.size() % 2 == 1) {
  67.                 out.add(in.size() - 2, in.get(median));
  68.         }
  69.          out.add(last, in.get(last)); 
  70.  
  71.          System.out.println("ArrayList : "+out + ".size("+out.size()+")");
  72.     }
  73.  
  74. }
Success #stdin #stdout 0.07s 380224KB
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Standard input is empty
stdout
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ArrayList : [1, 9, 2, 8, 3, 7, 4, 6, 5, 10].size(10)
LinkedList: [1, 9, 2, 8, 3, 7, 4, 6, 5, 10].size(10)
ArrayList : [1, 10, 2, 9, 3, 8, 4, 7, 5, 6, 11].size(11)
LinkedList: [1, 10, 2, 9, 3, 8, 4, 7, 5, 6, 11].size(11)
https://ideone.com/W3oqDP
language:
Java (12.0.1)
created:
11 years ago
visibility:
public

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