Hash Map in java

+++++++++++++    HashMap               +++++++++++
 - HashMap contains values based on the key. It implements the Map interface and extends the AbstractMap class.

 - It contains only Uniq elements
 - It may have one null key and multiple null values.
 - It maintains no order.

Sample code for HashMap:
package collections;
import java.util.*;
import java.util.HashMap;
import java.util.Map;

public class HashMapTest {
    public static void main(String[] args) {       
   
HashMap<Integer,String> hm=new HashMap<Integer,String>();
hm.put(100,"pabbu");
hm.put(200, "reddy");
hm.put(200, "reddy");

    for(HashMap.Entry m:hm.entrySet())
    {
        System.out.println(m.getKey() + " "+m.getValue());
       
    }
   
    }
}


Output:

100 pabbu
200 reddy