Java Part-31 | HashTable example in Java (Gujarati) смотреть онлайн

HashTable allows associating values with keys.
It allows efficient look ups for the value associated with the key
This class implements a hashtable, which maps keys to values.
Any non-null object can be used as a key or as a value.

Useful Operations:
put(Object key, Object value);
remove(Object key);
get(Object key);

The following example creates a hashtable of numbers.
It uses the names of the numbers as keys:

Hashtable numbers = new Hashtable(); numbers.put("one", new Integer(1));
numbers.put("two", new Integer(2)); numbers.put("three", new Integer(3));

To retrieve a number, use the following code:
Integer n = (Integer)numbers.get("two");
if (n != null)
{ System.out.println("two = " + n);
}

HashTable example:
import java.util.*;
public class HashtableDemo
{ public static void main(String[] args) {
Hashtable tbl = new Hashtable();
Person s, sRet;
s = new Person("101", "RaviROza.com");
tbl.put (s.getId(), s);
s = new Person("102", "wordpress.raviroza.com");
tbl.put (s.getId(), s);
sRet= (Person) tbl.get("101");
System.out.println("Name is = " + sRet.getName());
// Personname is = RaviROza.com
}
}


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