java.util.Hashtable class

java.util.Hashtable class

java.util.Hashtable class

• We can store group of objects in the form of key-value pairs in Hashtable object.
• Both key and values are objects only.
• Keys can be unique and values can be duplicate.
• Here group of objects means, it can allow us to store same type of objects and different type of objects.
• Same type means, assuming that all objects are in the form of integer types.
• Different type means, assuming that all objects are in the form of integer, float, String, Student and Customer types also.
• Size will increase dynamically.
• Hashtable is synchronized.

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Program         :       Example on Hashtable class

Program name  :       HTDemo1.java

Output            :         

      {10=Mouli, 9=Mohan, 3=Hari, 2=Sravan, 1=Nireekshan}

     

import java.util.Hashtable;

class HTDemo1

{

       public static void main(String args[])

       {

             Hashtable hashtable= new Hashtable();

              

             hashtable.put(1, "Nireekshan");

             hashtable.put(2, "Sravan");
             hashtable.put(10, "Mouli");

             hashtable.put(9, "Mohan");

             hashtable.put(3, "Hari");
             

             System.out.println(hashtable);

       }

}

Compile       :         javac HTDemo1.java

Run             :         java HTDemo1

Output        :         

     {10=Mouli, 9=Mohan, 3=Hari, 2=Sravan, 1=Nireekshan}

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Thanks for your time.

Nireekshan