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    <p>What you want is an enum containing all your elements, with a couple of methods. Here is an example, feel free to use it if it suites your needs.<br/> If desired, you can also make a second enum for Type (as Templar suggested) and add it as a field in you Element enum.</p> <pre><code>import java.util.ArrayList; import java.util.Arrays; import java.util.List; public enum Element { //Example instances, replace with what is appropriate for your game. WATER, // Basic WOOD, // Basic IRON, // Basic STONE, // Basic FIRE, // Basic CARBON(WOOD, FIRE), //Intermediate FORGE(STONE, IRON), // Intermediate STEEL(FORGE, IRON); // Final private Element[] parts; private Element() { //instantiates parts to prevent NullPointerException this.parts = new Element[0]; } private Element(Element... parts) { this.parts = parts; } /** * return all the parts of this Element. * @return */ public List&lt;Element&gt; getParts() { return Arrays.asList(parts); } /** * find all elements that have this Element listed as one of their parts. * * @param part * @return */ public List&lt;Element&gt; getComposites() { List&lt;Element&gt; composites = new ArrayList&lt;Element&gt;(); // Iterate through all Elements for (Element composite : Element.values()) { // Iterate through each Element's parts for (Element part : composite.parts) { // If the element has a part equal to the argument, // Add the element to the list of composites. if (part == this) { composites.add(composite); } } } return composites; } } </code></pre>
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