Java : Collection Framework : TreeMap (KeySet)

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TreeMapExample.java

import java.util.Set;
import java.util.TreeMap;

/*
 * Example of keySet() method.
 */
public class TreeMapExample
{
    public static void main( String[] args )
    {

        TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();

        treeMap.put(1, "Cat");
        treeMap.put(2, "Dog");
        treeMap.put(4, "Apple");
        treeMap.put(3, "Ball");

        System.out.println("treeMap : " + treeMap +"\n");
      
        /*
         * Returns a Set view of the keys contained in this map. The set is
         * backed by the map, so changes to the map are reflected in the set,
         * and vice-versa. 
         * 
         * If the map is modified while an iteration over the
         * set is in progress (except through the iterator's own remove
         * operation), the results of the iteration are undefined. The set
         * supports element removal, which removes the corresponding mapping
         * from the map, via the Iterator.remove, Set.remove, removeAll,
         * retainAll, and clear operations. It does not support the add or
         * addAll operations.
         */
        Set<Integer> set = treeMap.keySet();

        System.out.println("set : " + set + "\n");

        for( Integer key : set )
        {
            System.out.println(key);
        }

    }
}

Output

treeMap : {1=Cat, 2=Dog, 3=Ball, 4=Apple}

set : [1, 2, 3, 4]

1
2
3
4

To Download TreeMapDemoKeySet Project Click the below link
https://sites.google.com/site/javaee4321/java-collections/TreeMapDemoKeySet.zip?attredirects=0&d=1

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