Java类集-SortedSet接口

• TreeSet实现了SortedSet接口

  
  

   

  package iotest;

  import java.util.SortedSet;

  import java.util.TreeSet;

  public class sset {

  public static void main(String args[]){

  SortedSet<String> alls=new TreeSet<String>();

  alls.add("A");

  alls.add("M");

  alls.add("D");

  alls.add("F");

  alls.add("F");

  System.out.println(alls);

  System.out.println(alls.first());

  System.out.println(alls.last());

  System.out.println(alls.headSet("F"));

  System.out.println(alls.tailSet("D"));

  System.out.println(alls.subSet("D", "F"));

   

   

  }

   

  }