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Associative Array (Java and Corel Paradox Cross Reference Guide)

By Mike Prestwood

Java versus Corel Paradox: A side by side comparison between Java and Corel Paradox.

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"));
    }
}

Associative Arrays in Java (a Map)

Corel Paradox: DynArray

In ObjectPAL associative arrays are known as dynamic arrays.

Syntax Example:

var
  myDynArray   DynArray[] String
endVar

myDynArray["Last_Name"] = "Spitz"
myDynArray["First_Name"] = "Randy"

myDynArray.view()

ObjectPAL Associative Array (DynArray)