Java : Collection Framework : HashMap (Constructor accepts Map)

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HashMapExample.java

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

/*
 * Example of HashMap(Map<? extends K,? extends V> m) constructor.
 */
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");

        /*
         * Constructs a new HashMap with the same mappings as the specified Map.
         * The HashMap is created with default load factor (0.75) and an initial
         * capacity sufficient to hold the mappings in the specified Map.
         */

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

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

    }
}

Output

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

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

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

See also:

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