Create Hashtable from HashMap - Java Collection Framework

Java examples for Collection Framework:HashMap

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Description

Create Hashtable from HashMap

Demo Code


import java.util.Enumeration;
import java.util.Hashtable;
import java.util.HashMap;
 
public class Main {
 
  public static void main(String[] args) {
    HashMap hMap = new HashMap();
   //from w ww. j a v  a2 s.c o  m
    hMap.put("1","One");
    hMap.put("2","Two");
    hMap.put("3","Three");
   
    Hashtable ht = new Hashtable();
   
    ht.put("1","This value would be REPLACED !!");
    ht.put("4","Four");
   
    System.out.println("Hashtable contents before copy");
    Enumeration e = ht.elements();
    while(e.hasMoreElements())
      System.out.println(e.nextElement());
   
    ht.putAll(hMap);
   
    System.out.println("Hashtable contents after copy");
    e = ht.elements();
    while(e.hasMoreElements())
      System.out.println(e.nextElement());
   
  }
}

Result


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