Java 集合比较

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

public 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));

      for(int i=0; i<=10;i++)System.out.print('-');
      System.out.println(Collections.max(set));
      System.out.println(Collections.max(set, String.CASE_INSENSITIVE_ORDER));
   }
}