Java : Collection Framework : HashMap (PutAll)

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HashMapExample.java

import java.util.HashMap;
import java.util.TreeMap;

/*
 * Example of putAll(Map<? extends K,? extends V> m) method.
 */
public class HashMapExample
{
    public static void main( String[] args )
    {

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

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

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

        HashMap<Integer, String> hashMap = new HashMap<Integer, String>();

        /*
         * Copies all of the mappings from the specified map to this map. These
         * mappings will replace any mappings that this map had for any of the
         * keys currently in the specified map.
         */
        hashMap.putAll(treeMap);

        System.out.println("hashMap : " + hashMap);

    }
}

Output

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

hashMap : {1=Apple, 2=Ball, 3=Cat}

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

See also:

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