How to Add,remove, and get specific key and value from HashTable.
In this program we created a Hashtable and add some value with specific keys,after we check size of Hashtable,and remove some value with specific key.
import java.util.Hashtable; import java.util.Set; public class HashtableIteration { public static void main(String a[]){ //Create hashtable instance Hashtableht = new Hashtable (); //add key-value pair to hashtable ht.put("key1", "value1"); ht.put("key2", "value2"); ht.put("key3","value3"); System.out.println("Size of Hashtable :"+ht.size()); //getting value for the given key from hashtable System.out.println("Value of key 'key2': "+ht.get("key2")); System.out.println("Is Hashtable empty? "+ht.isEmpty()); ht.remove("key3"); System.out.println(ht); System.out.println("Size of the Hashtable: "+ht.size()); } }
Size of Hashtable :3 Value of key 'key2': value2 Is Hashtable empty? false {key2=value2, key1=value1} Size of the Hashtable: 2
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