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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.         Ideone mainClass = new Ideone();
  12.         Set<Integer> ints = new HashSet<Integer>();
  13.  
  14.         ints.add(3);
  15.         ints.add(5);
  16.         ints.add(7);
  17.  
  18.         ints = mainClass.recursiveSetCreator(ints);
  19.  
  20.         printOutput(ints);
  21.     }
  22.  
  23.     private static void printOutput(Set<Integer> ints) {
  24.         List list = new ArrayList(ints);
  25.         Collections.sort(list);
  26.         System.out.println(list);
  27.     }
  28.  
  29.     public Set<Integer> recursiveSetCreator(Set<Integer> recInput) {
  30.         if (recInput.size() == 1) {
  31.             return recInput;
  32.         }
  33.         List integerList = new ArrayList(recInput);
  34.         Integer lastItem = (Integer) integerList.remove(integerList.size() - 1);
  35.         recInput.remove(lastItem);
  36.         recInput = recursiveSetCreator(recInput);
  37.         int size = recInput.size();
  38.         integerList = new ArrayList(recInput);
  39.         for (int i = 0; i < size; i++) {
  40.             Integer item = (Integer) integerList.get(i);
  41.             recInput.add(item * lastItem);
  42.         }
  43.         recInput.add(lastItem);
  44.         return recInput;
  45.     }
  46. }
Success #stdin #stdout 0.07s 380160KB
comments (?)
stdin 
Standard input is empty
stdout 
[3, 5, 7, 15, 21, 35, 105]
https://ideone.com/h7Lk1l
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
public

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