What are associative arrays in Java?

What are associative arrays in Java?

Associative arrays in Java are often implemented using the HashMap class, which stores key-value pairs.

Can you give me an example of how to use a HashMap?

Sure! Here's a simple example:

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {
        HashMap<String, Integer> map = new HashMap<>();
        map.put("Apple", 1);
        map.put("Banana", 2);
        System.out.println(map.get("Apple")); // Output: 1
    }
}

What are the advantages of using HashMap?

HashMap provides fast access to elements, allows null values, and is not synchronized, making it efficient for single-threaded applications.

Are there any alternatives to HashMap?

Yes, alternatives include TreeMap, which maintains order, and LinkedHashMap, which maintains insertion order.