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Advanced Java Coursework
-Mostly Advanced Java Coursework -Edited roadmap to better reflect needs of FRC programming -Another QOL edit to the Notes viewer from local env to prod, in regards to arrow key nav and resolving urls, to check if works -Appendix was also edited I think in one of the other commits
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‎book/html/Advanced-Java/Hashsets.html‎

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<h1 class="menu-title">Montclair Robotics Programming</h1>
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<div id="content" class="content">
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<main>
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<div class="content-wrap">
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<h2 id="hashsets"><a class="header" href="#hashsets">HashSets</a></h2>
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<p>You’ve just learned that a HashMap stores key–value pairs, with each key being unique.</p>
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<p>A <code>HashSet</code> is similar, except it stores only the values, and each value must be unique.
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There are no keys — you just add elements, and the set makes sure no duplicates are allowed.</p>
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<p>Like <code>HashMap</code>, <code>HashSet</code> is contained in <code>java.util</code>.</p>
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<p>General Syntax for Creating a HashSet</p>
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<pre><code class="language-java">import java.util.HashSet;
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HashSet&lt;ElementType&gt; name = new HashSet&lt;ElementType&gt;();
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</code></pre>
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<p>To add items to a HashSet, use the method .add(E element) where E is the element type parameter.</p>
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<p>Here is an example of a set that stores String names:</p>
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<pre><code class="language-java">public class Program {
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public static void main(String[] args) {
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HashSet&lt;String&gt; names = new HashSet&lt;String&gt;();
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names.add("Johnny");
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names.add("Carl");
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names.add("Grandpa");
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names.add("Carl"); // duplicate - ignored
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System.out.println(names);
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// prints something like: [Grandpa, Johnny, Carl]
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// order is not guaranteed
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}
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}
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</code></pre>
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<p>More Methods
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To check if the set contains an element, use .contains(E element)</p>
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<p><b><code>names.contains("Carl"); // true</code></b>
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<b><code>names.contains("Billy"); // false</code></b></p>
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<p>To remove an element, use .remove(E element)</p>
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<p><b><code>names.remove("Johnny"); // Johnny is no longer in the set</code></b></p>
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<p>To get the number of items, use <code>.size()</code></p>
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<p><b><code>names.size();</code></b></p>
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<p>To remove all elements, use <code>.clear()</code></p>
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<p><b><code>names.clear();</code></b></p>
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<blockquote>
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<p>For more information, check out <a href="https://www.w3schools.com/java/java_hashset.asp">w3schools</a></p>
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</blockquote>
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<hr />
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<h2 id="task"><a class="header" href="#task">Task</a></h2>
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<p>Create a set of your favorite foods (Strings). Print the set, check if a certain food is in it, and remove one.</p>
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‎book/html/Advanced-Java/Inheritance.html‎

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