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Associative Array (Java and C# Cross Reference Guide)

By Mike Prestwood

Java versus C#: A side by side comparison between Java and C#.

 
Data Structures
 

Data structures allow you to store and work with data. Common data structures include arrays, associative arrays, etc.

Associative Array

[Other Languages] 
A set of unique keys linked to a set of values. Each unique key is associated with a value. Think of it as a two column table. MyArray['CA'] = 'California' MyArray['AR'] = 'Arizona'

Languages Focus

Associative arrays are also known as a dictionary or a hash table in other languages.

Java:   HashMap()

An associative array links a set of keys to a set of values. In Java, associative arrays are implemented as Maps.

This will print "Arizona."

Syntax Example:
import java.util.*;

public class Maps
{
    public static void main(String[] args)
    {
        Map states = new HashMap();
       
        states.put("CA", "California");
        states.put("FL", "Florida");
        states.put("AZ", "Arizona");

        System.out.println(states.get("AZ"));
    }
}
C#:   Dictionary
Syntax Example:
//using System.Collections.Generic;
 
Dictionary <String, String> airports = new Dictionary <String, String>();
airports.Add("LAX", "Los Angeles"); 
airports.Add("SFO", "San Francisco");
airports.Add("SAN", "San Diego");
MessageBox.Show(airports["LAX"]);












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