Java 从TreeMap获取头部地图

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

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import java.util.SortedMap;

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import java.util.TreeMap;

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public class Main {

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  public static void main(String[] args) {

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    TreeMap treeMap = new TreeMap();

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    treeMap.put("1","One");

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    treeMap.put("3","Three");

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    treeMap.put("2","Two");

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    treeMap.put("5","Five");

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    treeMap.put("4","Four");

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    SortedMap sortedMap = treeMap.headMap("3");

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