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130 lines
4.3 KiB
HTML
130 lines
4.3 KiB
HTML
<!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="Brandon Rozek">
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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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</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 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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Research
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Transcript
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</nav>
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<main class="main-content">
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<article class="article">
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<h1>Lecture for February 27th</h1>
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<h2>Review for midterm</h2>
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<p>Chapter 1 -- Code Style, API</p>
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<p>Chapter 2 -- Variables & Assignments, strings</p>
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<p>Chapter 3 -- input & output</p>
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<p>Chapter 4 -- branches (if, if/else, switch)</p>
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<p>Chapter 5 -- loops (while, for), scope</p>
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<p>Chapter 6 -- File Reading and Writing</p>
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<h2>Separated vs Connected Branches</h2>
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<p>What is the output of this code?</p>
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<pre><code class="language-java">String preferredLanguage = "Spanish";
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if (preferredLanguage.equals("Chinese")) {
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System.out.println("Ni hao!");
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}
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if (preferredLanguage.equals("Spanish")) {
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System.out.println("Hola!");
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}
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if (preferredLanguage.equals("French")) {
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System.out.println("Bonjour!");
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}
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if (preferredLanguage.equals("German")) {
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System.out.println("Gutentag!")
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} else {
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System.out.println("Hello!")
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}</code></pre>
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<p>The output is</p>
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<pre><code class="language-reStructuredText">Hola!
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Hello!</code></pre>
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<p>This is because each of the if statements are independent from each other. Whether or not the if statement gets check is not affected by the if statements around it.</p>
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<p>Since the preferred language equals Spanish it outputs <code>Hola!</code> But since the language is also <em>not German</em> it prints out <code>Hello!</code> as well.</p>
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<h2>Using an Array</h2>
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<p>Square brackets notation is used to access elements, array slots can be used as variables</p>
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<pre><code class="language-java">int[] array = new int[7]; // Creates an integer array of size 7
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array[0] = 5;</code></pre>
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<h2>Swapping Elements</h2>
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<p>You can swap <code>x</code> and <code>y</code> in the following way with a <em>temporary</em> variable</p>
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<pre><code class="language-java">int x = 6;
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int y = 1;
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int temp = x;
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x = y;
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y = temp;</code></pre>
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<h2>Two-Dimensional Arrays</h2>
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<pre><code class="language-java">// Creates a 2D array of two rows and three columns
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int[][] a = new int[2][3]</code></pre>
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<p>You can access an element of this 2D array using the conventional square bracket notation</p>
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<pre><code class="language-java">a[0][0] = 5;</code></pre>
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</article>
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