Java 从HashMap获取键的Set视图

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import java.util.Iterator;/**n o w  j a v a  . c o m**/

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import java.util.HashMap;

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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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    HashMap hMap = new HashMap();

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    hMap.put("1","One");

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    hMap.put("2","Two");

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    hMap.put("3","Three");

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    Set st = hMap.keySet();//n o w j a v a . c o m 提供

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    System.out.println("Set created from HashMap 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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    st.remove("2");

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