Write a Java Program to Iterate over a HashMap

import java.util.HashMap;
import java.util.Map.Entry;

class Main {
public static void main(String[] args) {

// Creating a HashMap
HashMap<String, String> languages = new HashMap<>();
languages.put(“Java”, “Enterprise”);
languages.put(“Python”, “ML/AI”);
languages.put(“JavaScript”, “Frontend”);
System.out.println(“HashMap: ” + languages);

// iterating through key/value mappings
System.out.print(“Entries: “);
for(Entry<String, String> entry: languages.entrySet()) {
System.out.print(entry);
System.out.print(“, “);
}

// iterating through keys
System.out.print(“\nKeys: “);
for(String key: languages.keySet()) {
System.out.print(key);
System.out.print(“, “);
}

// iterating through values
System.out.print(“\nValues: “);
for(String value: languages.values()) {
System.out.print(value);
System.out.print(“, “);
}
}
}

2: Iterate through HashMap using iterator()

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map.Entry;

class Main {
public static void main(String[] args) {
// create a HashMap
HashMap<String, String> languages = new HashMap<>();
languages.put(“Java”, “Enterprise”);
languages.put(“Python”, “ML/AI”);
languages.put(“JavaScript”, “Frontend”);
System.out.println(“HashMap: ” + languages);

// create an object of Iterator
Iterator<Entry<String, String>> iterate1 = languages.entrySet().iterator();

// iterate through key/value mappings
System.out.print(“Entries: “);
while(iterate1.hasNext()) {
System.out.print(iterate1.next());
System.out.print(“, “);
}

// iterate through keys
Iterator<String> iterate2 = languages.keySet().iterator();
System.out.print(“\nKeys: “);
while(iterate2.hasNext()) {
System.out.print(iterate2.next());
System.out.print(“, “);
}

// iterate through values
Iterator<String> iterate3 = languages.values().iterator();
System.out.print(“\nValues: “);
while(iterate3.hasNext()) {
System.out.print(iterate3.next());
System.out.print(“, “);
}
}
}