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2022-02-15 01:14:58 -05:00
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2020-01-15 23:07:02 -05:00
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<h1>Lecture for March 29th</h1>
<h2>Enumerated Types</h2>
<p>These represent a fixed set of constants and include all possible values within them.</p>
<p>Let's look at coins. On a daily basis in the US, we use the following coins:</p>
<ul>
<li>Penny</li>
<li>Nickel</li>
<li>Dime</li>
<li>Quarter</li>
</ul>
<p>Other examples include the days of the week, clothes sizes, etc.</p>
<h2>Enum Syntax</h2>
<p>Let's define an <code>enum</code> type</p>
<pre><code class="language-java">public enum Coin { PENNY, NICKEL, DIME, QUARTER}</code></pre>
<p>Now declare and initialize a variable</p>
<pre><code class="language-java">Coin myCoin = Coin.PENNY</code></pre>
<h2>Arrays vs ArrayList</h2>
<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>
<p>Arrays can store objects and primitives such as <code>int</code>, <code>char</code>, <code>boolean</code>, etc.</p>
<p>ArrayLists can only store objects.</p>
<h3>How to declare an ArrayList</h3>
<pre><code class="language-java">ArrayList&lt;objectType&gt; list = new ArrayList&lt;objectType&gt;();</code></pre>
<h3>Differences between getting the length of the array</h3>
<p><strong>Array</strong></p>
<pre><code class="language-java">int length = array.length;</code></pre>
<p><strong>ArrayList</strong></p>
<pre><code class="language-java">int length = array.size();</code></pre>
<h2>For Each Loop</h2>
<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>
<pre><code class="language-java">for (String b : buildings) {
System.out.print(b);
}</code></pre>
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