iterate over map keys java

public static void printMap(Map mp) {
    Iterator it = mp.entrySet().iterator();
    while (it.hasNext()) {
        Map.Entry pair = (Map.Entry)it.next();
        System.out.println(pair.getKey() + " = " + pair.getValue());
        it.remove(); // avoids a ConcurrentModificationException
    }
}// Java program for traversing 
// through a hashmap using for-each loop 
  
import java.util.*; 
  
class GfG { 
    public static void main(String[] args) 
    { 
  
        // Consider the hashmap containing 
        // student name and their marks 
        HashMap<String, Integer> hm =  
                     new HashMap<String, Integer>(); 
  
        // Adding mappings to HashMap 
        hm.put("GeeksforGeeks", 54); 
        hm.put("A computer portal", 80); 
        hm.put("For geeks", 82); 
  
        // Printing the HashMap 
        System.out.println("Created hashmap is" + hm); 
  
        // Loop through the hashmap 
        System.out.println("HashMap after adding bonus marks:"); 
  
        // Using for-each loop 
        for (Map.Entry mapElement : hm.entrySet()) { 
            String key = (String)mapElement.getKey(); 
  
            // Add some bonus marks 
            // to all the students and print it 
            int value = ((int)mapElement.getValue() + 10); 
  
            System.out.println(key + " : " + value); 
        } 
    } 
} 
// Java program to demonstrate iteration over  
// Map.entrySet() entries using for-each loop 
  
import java.util.Map; 
import java.util.HashMap; 
  
class IterationDemo  
{ 
    public static void main(String[] arg) 
    { 
        Map<String,String> gfg = new HashMap<String,String>(); 
      
        // enter name/url pair 
        gfg.put("GFG", "geeksforgeeks.org"); 
        gfg.put("Practice", "practice.geeksforgeeks.org"); 
        gfg.put("Code", "code.geeksforgeeks.org"); 
        gfg.put("Quiz", "quiz.geeksforgeeks.org"); 
          
        // using for-each loop for iteration over Map.entrySet() 
        for (Map.Entry<String,String> entry : gfg.entrySet())  
            System.out.println("Key = " + entry.getKey() + 
                             ", Value = " + entry.getValue()); 
    } 
}