从TreeMap获取子地图

import java.util.TreeMap;

import java.util.SortedMap;//来自 nowjava.com - 时代Java

 

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.subMap("2",