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98 lines
3.4 KiB
HTML
98 lines
3.4 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="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 on October 4th</h1>
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<h2>Pass by Copy vs Pass by Reference</h2>
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<h3>Pass by Copy</h3>
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<p>When you pass a primitive type into a method (int, char, double, float, etc), it makes a copy of the value of the variable and brings it into the method</p>
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<h3>Pass by Reference</h3>
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<p>When you pass an array into a method (int[], char[], double[], etc[]), it passes in the reference of the variable into the method. In other words, you give the actual array into the method and allows the method to change it.</p>
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<h3>What's the Implication?</h3>
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<p>If you change the primitive in a method, it doesn't actually change the value of the variable.</p>
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<p>If you pass in an array and change it in the method, it has been permanently changed outside the method as well.</p>
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<h3>How do I make it so I can't change my array by accident?</h3>
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<p>Use the <code>final</code>keyword in the method header</p>
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<pre><code class="language-java">public static void printAll(final int[] array) {
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for (int i = 0; i < array.length; i++) {
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System.out.println("Number " + (i + 1) + " is " + array[i])
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}
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}</code></pre>
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</article>
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</main>
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