import java.util.HashMap;

import java.util.Map;

public class Hashmap

{

public static void main(String[] args)

{

HashMap<String, Integer> map = new HashMap<>();

print(map);

map.put("abc", 10);

map.put("mno", 30);

map.put("xyz", 20);

System.out.println("Size of map is" + map.size());

print(map);

if (map.containsKey("abc"))

{

Integer a = map.get("abc");

System.out.println("value for key \"abc\" is:- " + a);

}

map.clear();

print(map);

}

public static void print(Map<String, Integer> map)

{

if (map.isEmpty())

{

System.out.println("map is empty");

}

else

{

System.out.println(map);

}

}

}

On executing the HashMap program, output goes like this:

1

2

3

4

5

map is empty

Size of map is:- 3

{abc=10, xyz=20, mno=30}

value for key "abc" is:- 10

map is empty