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115 lines
3.9 KiB
HTML
115 lines
3.9 KiB
HTML
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="author" content="Fredrik Danielsson, http://lostkeys.se">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<meta name="robots" content="noindex" />
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<title>Brandon Rozek</title>
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<link rel="stylesheet" href="themes/bitsandpieces/styles/main.css" type="text/css" />
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<link rel="stylesheet" href="themes/bitsandpieces/styles/highlightjs-github.css" type="text/css" />
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</head>
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<body>
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<aside class="main-nav">
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<nav>
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<ul>
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<li class="menuitem ">
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<a href="index.html%3Findex.html" data-shortcut="">
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Home
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Fcourses.html" data-shortcut="">
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Courses
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Flabaide.html" data-shortcut="">
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Lab Aide
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Fpresentations.html" data-shortcut="">
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Presentations
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Fresearch.html" data-shortcut="">
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Research
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</a>
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</li>
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<li class="menuitem ">
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<a href="index.html%3Ftranscript.html" data-shortcut="">
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Transcript
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</a>
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</li>
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</ul>
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</nav>
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</aside>
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<main class="main-content">
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<article class="article">
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<h1>Lecture for March 29th</h1>
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<h2>Enumerated Types</h2>
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<p>These represent a fixed set of constants and include all possible values within them.</p>
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<p>Let's look at coins. On a daily basis in the US, we use the following coins:</p>
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<ul>
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<li>Penny</li>
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<li>Nickel</li>
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<li>Dime</li>
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<li>Quarter</li>
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</ul>
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<p>Other examples include the days of the week, clothes sizes, etc.</p>
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<h2>Enum Syntax</h2>
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<p>Let's define an <code>enum</code> type</p>
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<pre><code class="language-java">public enum Coin { PENNY, NICKEL, DIME, QUARTER}</code></pre>
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<p>Now declare and initialize a variable</p>
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<pre><code class="language-java">Coin myCoin = Coin.PENNY</code></pre>
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<h2>Arrays vs ArrayList</h2>
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<p>Arrays require you to say upfront, how many slots you need. ArrayLists are more flexible since you can change the length of the array during Runtime. </p>
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<p>Arrays can store objects and primitives such as <code>int</code>, <code>char</code>, <code>boolean</code>, etc.</p>
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<p>ArrayLists can only store objects.</p>
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<h3>How to declare an ArrayList</h3>
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<pre><code class="language-java">ArrayList<objectType> list = new ArrayList<objectType>();</code></pre>
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<h3>Differences between getting the length of the array</h3>
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<p><strong>Array</strong></p>
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<pre><code class="language-java">int length = array.length;</code></pre>
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<p><strong>ArrayList</strong></p>
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<pre><code class="language-java">int length = array.size();</code></pre>
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<h2>For Each Loop</h2>
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<p>This is a special loop in where you tell it to go through all the elements of the array, without specifying an index.</p>
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<pre><code class="language-java">for (String b : buildings) {
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System.out.print(b);
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}</code></pre>
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</article>
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</main>
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<script type="text/javascript"
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<script>
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hljs.initHighlightingOnLoad();
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</body>
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</html>
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