HashMap is a subclass of the AbstractMap class, used to store key-value pairs. Each key maps to a single value in the map, and keys are unique . This means we can only insert a key once into the map, and duplicate keys are not allowed , but the value can be mapped to multiple keys. We can add elements using the put() method of the HashMap class and iterate elements using the Iterator interface.
public V put(K key, V value)
import java.util.*;
import java.util.Map.*;
public class HashMapTest {
public static void main(String[] args) {
HashMap map = new HashMap();
<strong> </strong>// adding the elements to hashmap using put() method
map.put("1", "Adithya");
map.put("2", "Jai");
map.put("3", "Chaitanya");
map.put("4", "Krishna");
map.put("5", "Ramesh");
if(!map.isEmpty()) {
Iterator it = map.entrySet().iterator();
while(it.hasNext()) {
Map.Entry obj = (Entry)it.next();
System.out.println(obj.getValue());
}
}
}
}Adithya Jai Chaitanya Krishna Ramesh
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