How to get value of key in HashMap

import java.util.HashMap;
import java.util.Map;

public class HashMapGetValueOfkey {
public static void main(String[] args) {

Map<Integer,String> hm = new HashMap<Integer,String>();

/*
* Associates the specified value with the specified key in
this map (optional operation). If the map previously
contained a mapping for the key, the old value is
replaced by the specified value
*/
hm.put(1,”ankush”);
hm.put(2, “amit”);
hm.put(3,”shivam”);
hm.put(4,”ankit”);
hm.put(5, “yogesh”);

/*
* Returns the value to which the specified
* key is mapped, or null if this map contains
*  no mapping for the key.
*/

System.out.println(” key = 1 and value = “+hm.get(1));
System.out.println(” key = 1 and value = “+hm.get(10));

System.out.println(” key = 1 and value = “+hm.get(5));
System.out.println(” key = 1 and value = “+hm.get(4));

}

}

Output:

key = 1 and value = ankush

key = 1 and value = null

key = 1 and value = yogesh

key = 1 and value = ankit

 

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