Java 遍历TreeMap的值

/**from n  o  w  j  a  v  a . c o m**/

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import java.util.Collection;

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import java.util.TreeMap;

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import java.util.Iterator;

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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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    //add key value pairs to TreeMap

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    treeMap.put("1","One");

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    treeMap.put("2","Two");

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    treeMap.put("3","Three");

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    Collection c = treeMap.values();

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    //obtain an Iterator for Collection

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    Iterator itr = c.iterator();

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    //iterate through TreeMap values iterator

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