从TreeMap获取头部地图

 //from N o  w  J a v a . c o m - 时  代  Java

import java.util.SortedMap;

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");

    SortedMap sortedMap = treeMap.headMap(