Java Hashtable example

Chapter: Collections Last Updated: 07-11-2017 18:07:31 UTC

Program:

            /* ............... START ............... */
                
import java.util.Hashtable;
import java.util.Map;

public class JavaHashTableExample {

	public static void main(String args[]) {
		Hashtable<Integer, String> hashTable = new Hashtable<Integer, String>();

		hashTable.put(1,"Peter");
		hashTable.put(2,"Jack");
		hashTable.put(3, "Harry");
		hashTable.put(4,"Sharon");

		for (Map.Entry m : hashTable.entrySet()) {
			System.out.println(m.getKey() + " " + m.getValue());
		}
	}
}

                /* ............... END ............... */
        

Output

4 Sharon
3 Harry
2 Jack
1 Peter

Notes:

  • Java Hashtable class implements a hashtable, which maps keys to values.
  • Hashtable is similar to HashMap except it is synchronized.
  • Hashtable contains only unique elements.
  • Hashtable is synchronized.
  • Syntax : public class Hashtable<K,V> extends Dictionary<K,V> implements Map<K,V>, Cloneable, Serializable
  • K: It is the type of keys maintained by this map.
  • V: It is the type of mapped values.

Tags

Collection, Java Hashtable, Java

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