1 import java.util.Iterator; 2 import java.util.TreeMap; 3  4 import cn.itcast.p2.bean.Student; 5 import cn.itcast.p3.comparator.ComparatorByName; 6  7 public class TreeMapDemo { 8  9     public static void main(String[] args) {10         TreeMap<Student,String> tm = new TreeMap<Student,String>(new ComparatorByName());11         12         tm.put(new Student("lisi",38), "北京");13         tm.put(new Student("zhaoliu",24), "上海");14         tm.put(new Student("xiaoqiang",31), "沈阳");15         tm.put(new Student("wangcai",38), "大连");16         tm.put(new Student("zhaoliu",24), "铁岭");17         18         Iterator<Student> it = tm.keySet().iterator();19         while (it.hasNext())20         {21             Student key = it.next();22             String value =http://www.mamicode.com/ tm.get(key);23             System.out.println(key.getName()+":"+key.getAge()+"--"+value);24         }25 26 27     }28 29 }