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+import java.util.HashMap;
+import java.util.Map;
+
+public class AccessKeysFromHashMapExample {
+    public static void main(String[] args) {
+        Map<String, String> userCityMapping = new HashMap<>();
+
+        // Check if a HashMap is empty
+        System.out.println("is userCityMapping empty? : " + userCityMapping.isEmpty());
+
+        userCityMapping.put("John", "New York");
+        userCityMapping.put("Rajeev", "Bengaluru");
+        userCityMapping.put("Steve", "London");
+
+        System.out.println("userCityMapping HashMap : " + userCityMapping);
+
+        // Find the size of a HashMap
+        System.out.println("We have the city information of " + userCityMapping.size() + " users");
+
+        String userName = "Steve";
+        // Check if a key exists in the HashMap
+        if(userCityMapping.containsKey(userName)) {
+            // Get the value assigned to a given key in the HashMap
+            String city = userCityMapping.get(userName);
+            System.out.println(userName + " lives in " + city);
+        } else {
+            System.out.println("City details not found for user " + userName);
+        }
+
+        // Check if a value exists in a HashMap
+        if(userCityMapping.containsValue("New York")) {
+            System.out.println("There is a user in the userCityMapping who lives in New York");
+        } else {
+            System.out.println("There is not user in the userCityMapping who lives in New York");
+        }
+
+
+        // Modify the value assigned to an existing key
+        userCityMapping.put(userName, "California");
+        System.out.println(userName + " moved to a new city " + userCityMapping.get(userName) + ", New userCityMapping : " + userCityMapping);
+
+        // The get() method returns `null` if the specified key was not found in the HashMap
+        System.out.println("Lisa's city : " + userCityMapping.get("Lisa"));
+    }
+}
+
+***************************************************************************************************************************************************************************
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class CreateHashMapExample {
+    public static void main(String[] args) {
+        // Creating a HashMap
+        Map<String, Integer> numberMapping = new HashMap<>();
+
+        // Adding key-value pairs to a HashMap
+        numberMapping.put("One", 1);
+        numberMapping.put("Two", 2);
+        numberMapping.put("Three", 3);
+
+        // Add a new key-value pair only if the key does not exist in the HashMap, or is mapped to `null`
+        numberMapping.putIfAbsent("Four", 4);
+
+        System.out.println(numberMapping);
+    }
+}
+***************************************************************************************************************************************************************************
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+public class HashMapEntryKeySetValuesExample {
+    public static void main(String[] args) {
+        Map<String, String> countryISOCodeMapping = new HashMap<>();
+
+        countryISOCodeMapping.put("India", "IN");
+        countryISOCodeMapping.put("United States of America", "US");
+        countryISOCodeMapping.put("Russia", "RU");
+        countryISOCodeMapping.put("Japan", "JP");
+        countryISOCodeMapping.put("China", "CN");
+
+        // HashMap's entry set
+        Set<Map.Entry<String, String>> countryISOCodeEntries = countryISOCodeMapping.entrySet();
+        System.out.println("countryISOCode entries : " + countryISOCodeEntries);
+
+        // HashMap's key set
+        Set<String> countries = countryISOCodeMapping.keySet();
+        System.out.println("countries : " + countries);
+
+        // HashMap's values
+        Collection<String> isoCodes = countryISOCodeMapping.values();
+        System.out.println("isoCodes : " + isoCodes);
+    }
+}
+***************************************************************************************************************************************************************************
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+public class IterateOverHashMap {
+    public static void main(String[] args) {
+        Map<String, Double> employeeSalary = new HashMap<>();
+        employeeSalary.put("David", 76000.00);
+        employeeSalary.put("John", 120000.00);
+        employeeSalary.put("Mark", 95000.00);
+        employeeSalary.put("Steven", 134000.00);
+
+        System.out.println("=== Iterating over a HashMap using Java 8 forEach and lambda ===");
+        employeeSalary.forEach((employee, salary) -> {
+            System.out.println(employee + " => " + salary);
+        });
+
+        System.out.println("\n=== Iterating over the HashMap's entrySet using iterator() ===");
+        Set<Map.Entry<String, Double>> employeeSalaryEntries = employeeSalary.entrySet();
+        Iterator<Map.Entry<String, Double>> employeeSalaryIterator = employeeSalaryEntries.iterator();
+        while (employeeSalaryIterator.hasNext()) {
+            Map.Entry<String, Double> entry = employeeSalaryIterator.next();
+            System.out.println(entry.getKey() + " => " + entry.getValue());
+        }
+
+        System.out.println("\n=== Iterating over the HashMap's entrySet using Java 8 forEach and lambda ===");
+        employeeSalary.entrySet().forEach(entry -> {
+            System.out.println(entry.getKey() + " => " + entry.getValue());
+        });
+
+        System.out.println("\n=== Iterating over the HashMap's entrySet using simple for-each loop ===");
+        for(Map.Entry<String, Double> entry: employeeSalary.entrySet()) {
+            System.out.println(entry.getKey() + " => " + entry.getValue());
+        }
+
+        System.out.println("\n=== Iterating over the HashMap's keySet ===");
+        employeeSalary.keySet().forEach(employee -> {
+            System.out.println(employee + " => " + employeeSalary.get(employee));
+        });
+    }
+}
+
+
+
+************************************************************************************************************************************************************************
+
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+public class IterateOverHashMap {
+    public static void main(String[] args) {
+        Map<String, Double> employeeSalary = new HashMap<>();
+        employeeSalary.put("David", 76000.00);
+        employeeSalary.put("John", 120000.00);
+        employeeSalary.put("Mark", 95000.00);
+        employeeSalary.put("Steven", 134000.00);
+
+        System.out.println("=== Iterating over a HashMap using Java 8 forEach and lambda ===");
+        employeeSalary.forEach((employee, salary) -> {
+            System.out.println(employee + " => " + salary);
+        });
+
+        System.out.println("\n=== Iterating over the HashMap's entrySet using iterator() ===");
+        Set<Map.Entry<String, Double>> employeeSalaryEntries = employeeSalary.entrySet();
+        Iterator<Map.Entry<String, Double>> employeeSalaryIterator = employeeSalaryEntries.iterator();
+        while (employeeSalaryIterator.hasNext()) {
+            Map.Entry<String, Double> entry = employeeSalaryIterator.next();
+            System.out.println(entry.getKey() + " => " + entry.getValue());
+        }
+
+        System.out.println("\n=== Iterating over the HashMap's entrySet using Java 8 forEach and lambda ===");
+        employeeSalary.entrySet().forEach(entry -> {
+            System.out.println(entry.getKey() + " => " + entry.getValue());
+        });
+
+        System.out.println("\n=== Iterating over the HashMap's entrySet using simple for-each loop ===");
+        for(Map.Entry<String, Double> entry: employeeSalary.entrySet()) {
+            System.out.println(entry.getKey() + " => " + entry.getValue());
+        }
+
+        System.out.println("\n=== Iterating over the HashMap's keySet ===");
+        employeeSalary.keySet().forEach(employee -> {
+            System.out.println(employee + " => " + employeeSalary.get(employee));
+        });
+    }
+}
+
+************************************************************************************************************************************************************************
+import java.util.HashMap;
+import java.util.Map;
+
+public class RemoveKeysFromHashMapExample {
+    public static void main(String[] args) {
+        Map<String, String> husbandWifeMapping = new HashMap<>();
+        husbandWifeMapping.put("Jack", "Marie");
+        husbandWifeMapping.put("Chris", "Lisa");
+        husbandWifeMapping.put("Steve", "Jennifer");
+
+        System.out.println("Husband-Wife Mapping : " + husbandWifeMapping);
+
+        // Remove a key from the HashMap
+        // Ex - Unfortunately, Chris got divorced. Let's remove him from the mapping
+        String husband = "Chris";
+        String wife = husbandWifeMapping.remove(husband);
+
+        System.out.println("Couple (" + husband + " => " + wife + ") got divorced");
+        System.out.println("New Mapping : " + husbandWifeMapping);
+
+        // Remove a key from the HashMap only if it is mapped to the given value
+        // Ex - Divorce "Jack" only if He is married to "Linda"
+        boolean isRemoved = husbandWifeMapping.remove("Jack", "Linda");
+        System.out.println("Did Jack get removed from the mapping? : " + isRemoved);
+
+        // remove() returns null if the mapping was not found for the supplied key
+        wife = husbandWifeMapping.remove("David");
+        if(wife == null) {
+            System.out.println("Looks like David is not married to anyone");
+        } else {
+            System.out.println("Removed David and his wife from the mapping");
+        }
+    }
+}
+