What is Map in Java? How to create and run loop in Map and Set?

 

• Map is an interface
• Part of Collection
• Key and value pair
• Usage: Search, edit and delete elements respective to key
• Map doesn't allow duplicate keys.
• Hashmap will allow null keys and values
• Methods: getKey(), getValue(), entrylist

CODE to run loop with Map and Set?

public static void listcheck() {

 

   Map<String,String> hmap= new HashMap<String,String>();

   hmap.put("urigetuser","https://reqres.in/api/users?page=2");

   hmap.put("first_name","janet");

   

   Set<String> hset = new HashSet<String>();

   Set<Entry<String, String>> esets = hmap.entrySet();

   for (Map.Entry<String, String> ent : esets) {

   System.out.print(ent.getKey() + ent.getValue());

   }

 }

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