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114 lines
3.9 KiB
HTML
114 lines
3.9 KiB
HTML
<!DOCTYPE html>
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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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