Loop through a Dictionary

The Dictionary class provides a method named keys() which returns an enumeration object holding the all keys in the hash table.

Using this method get the keys and retrieve the value of each key using the get() method.

The hasMoreElements() method of the Enumeration (interface) returns true if the enumeration object has more elements. You can use this method to run the loop.

Example

import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Dictionary;

public class Loopthrough {
   public static void main(String args[]) {
      String str;
      Dictionary dic = new Hashtable();
      dic.put("Ram", 94.6);
      dic.put("Rahim", 92);
      dic.put("Robert", 85);
      dic.put("Roja", 93);
      dic.put("Raja", 75);
      
      Enumeration keys = dic.keys();
      System.out.println("Contents of the hash table are :");
      
      while(keys.hasMoreElements()) {
         str = (String) keys.nextElement();
         System.out.println(str + ": " + dic.get(str));
      }       
   }
}

Output

Contents of the hash table are :
Rahim: 92
Roja: 93
Raja: 75
Ram: 94.6
Robert: 85