Java Hashtable From HashMap Example

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import java.util.Enumeration;
import java.util.Hashtable;
import java.util.HashMap;

public class JavaHashTableHashMapExample {
	
	public static void main(String[] args) {
		   
	    HashMap hashMap = new HashMap();

	    hashMap.put("1","One");
	    hashMap.put("2","Two");
	    hashMap.put("3","Three");
	   
	    Hashtable hashTable = new Hashtable();
	   
	    hashTable.put("1","This value would be REPLACED !!");
	    hashTable.put("4","Four");

	    System.out.println("Hashtable contents before copy");
	    Enumeration enumeration = hashTable.elements();
	    while(enumeration.hasMoreElements())
	    System.out.println(enumeration.nextElement());
	   
	    hashTable.putAll(hashMap);
	   
	    //display contents of Hashtable
	    System.out.println("Hashtable contents after copy");
	    enumeration = hashTable.elements();
	    while(enumeration.hasMoreElements())
	      System.out.println(enumeration.nextElement());
	   
	  }
}

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