// Java program to remove an entry using key
// from a HashMap while iterating over it
  
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Create a HashMap
        HashMap<Integer, String>
            map = new HashMap<>();
  
        // Populate the HashMap
        map.put(1, "Geeks");
        map.put(2, "ForGeeks");
        map.put(3, "GeeksForGeeks");
  
        // Get the key to be removed
        int keyToBeRemoved = 2;
  
        // Print the initial HashMap
        System.out.println("Original HashMap: "
                           + map);
  
        // Get the iterator over the HashMap
        Iterator<Map.Entry<Integer, String> >
            iterator = map.entrySet().iterator();
  
        // Iterate over the HashMap
        while (iterator.hasNext()) {
  
            // Get the entry at this iteration
            Map.Entry<Integer, String>
                entry
                = iterator.next();
  
            // Check if this key is the required key
            if (keyToBeRemoved == entry.getKey()) {
  
                // Remove this entry from HashMap
                iterator.remove();
            }
        }
  
        // Print the modified HashMap
        System.out.println("Modified HashMap: "
                           + map);
    }
}

Original HashMap: {1=Geeks, 2=ForGeeks, 3=GeeksForGeeks}
Modified HashMap: {1=Geeks, 3=GeeksForGeeks}

// Java program to remove an entry using key
// from a HashMap while iterating over it
  
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Create a HashMap
        HashMap<Integer, String>
            map = new HashMap<>();
  
        // Populate the HashMap
        map.put(1, "Geeks");
        map.put(2, "ForGeeks");
        map.put(3, "GeeksForGeeks");
  
        // Get the key to be removed
        int keyToBeRemoved = 2;
  
        // Print the initial HashMap
        System.out.println("Original HashMap: "
                           + map);
  
        // Remove the specified entry from the Map
        map.entrySet()
            .removeIf(
                entry -> (keyToBeRemoved == entry.getKey()));
  
        // Print the modified HashMap
        System.out.println("Modified HashMap: "
                           + map);
    }
}

Original HashMap: {1=Geeks, 2=ForGeeks, 3=GeeksForGeeks}
Modified HashMap: {1=Geeks, 3=GeeksForGeeks}