Get the min value within a collection

 
import java.util.Collections;
import java.util.Set;
import java.util.TreeSet;

class MainClass {
  public static void main(String[] args) {
    String[] coins = { "Penny", "nickel", "dime", "Quarter", "dollar" };

    Set set = new TreeSet();
    for (int i = 0; i < coins.length; i++)
      set.add(coins[i]);

    System.out.println(Collections.min(set));
    System.out.println(Collections.min(set, String.CASE_INSENSITIVE_ORDER));

    System.out.println("");

    System.out.println(Collections.max(set));
    System.out.println(Collections.max(set, String.CASE_INSENSITIVE_ORDER));
  }
}