JAVA

hashtable java

import java.util.*;  
class Hashtable1{  
 public static void main(String args[]){  
  Hashtable<Integer,String> hm=new Hashtable<Integer,String>();  
  
  hm.put(100,"Amit");  
  hm.put(102,"Ravi");  
  hm.put(101,"Vijay");  
  hm.put(103,"Rahul");  
  
  for(Map.Entry m:hm.entrySet()){  
   System.out.println(m.getKey()+" "+m.getValue());  
  }  
 }  
}  

hashtable in java

- HashTable don't have null key, sychronized(thread-safe)
  Good for parallel testing

hashtable

- HashTable don't have null key, sychronized(thread-safe)
good for parallel testing

Java HashTable

//Java Hashtable
//--------------
  
import java.io.*;
import java.util.*;
  
class AddElementsToHashtable {
    public static void main(String args[])
    {
       
        Hashtable<Integer, String> h1 = new Hashtable<>();
  
        // Initialization of a Hashtable using Generics
        Hashtable<Integer, String> h2 = new Hashtable<Integer, String>();
  
        // Inserting the Elements using put() method
        //                              ------------
        ht1.put(1, "Chris");
        ht1.put(2, "Tony");
        ht1.put(3, "Peter");
        ht2.put(4, "Steven");
  
        // Print mappings to the console (Output)
        System.out.println("Mappings of Hash Table 1 : " + h1);
        System.out.println("Mappings of Hash Table 2 : " + h2);
    }
}