获取存储在Java TreeMap中的最低和最高密钥

//N o w J a v a . c o m - 时  代  Java

 

import java.util.TreeMap;

 

public class Main {

 

  public static void main(String[] args) {

    TreeMap treeMap = new TreeMap();


    treeMap.put("1","One");

    treeMap.put("3","Three");

    treeMap.put("2","Two");

    treeMap.put("5","Five");

    treeMap.put("4","Four");

   

    System.out.println("Lowest key Stored in Java TreeMap is : " + treeMap.firstKey());


  }

}