Use TreeSet to sort random numbers : TreeSet « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. TreeSet

import java.util.Iterator;
import java.util.TreeSet;

public class MainClass {
  public static void main(String[] argv) {
    TreeSet set = new TreeSet();
    for (int i = 0; i < 3; i++)
      set.add(Math.random());

    Iterator iter = set.iterator();
    while (iter.hasNext())
      System.out.println(iter.next());

  }
}

0.21972875445139584
0.27062139982567435
0.9615419196391383