Java 从TreeMap获取密钥集视图

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import java.util.Iterator;// 来 自 时 代 J a v a 公 众 号 - N o w J a v  a . c o m

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import java.util.TreeMap;

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import java.util.Set;

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public class Main {

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  public static void main(String[] args) {

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    //create TreeMap object

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    TreeMap treeMap = new TreeMap();

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    //add key value pairs to 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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    Set st = treeMap.keySet();//n o w    j a v a  . c o m

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    System.out.println("Set created from TreeMap Keys contains :");

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    Iterator itr = st.iterator();

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    while(itr.hasNext())

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      System.out.println(itr.next());

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    //remove 1 from Set

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    st.remove("1");

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