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    <h1>Lecture on October 4th</h1>
<h2>Pass by Copy vs Pass by Reference</h2>
<h3>Pass by Copy</h3>
<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>
<h3>Pass by Reference</h3>
<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>
<h3>What's the Implication?</h3>
<p>If you change the primitive in a method, it doesn't actually change the value of the variable.</p>
<p>If you pass in an array and change it in the method, it has been permanently changed outside the method as well.</p>
<h3>How do I make it so I can't change my array by accident?</h3>
<p>Use the <code>final</code>keyword in the method header</p>
<pre><code class="language-java">public static void printAll(final int[] array) {
    for (int i = 0; i &lt; array.length; i++) {
        System.out.println("Number " + (i + 1) + " is " + array[i])
    }
}</code></pre>
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Fixed meta tags 2022-02-15 01:14:58 -05:00			`<meta name="author" content="Brandon Rozek">`
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			`<main class="main-content">`
			`<article class="article">`
			`<h1>Lecture on October 4th</h1>`
			`<h2>Pass by Copy vs Pass by Reference</h2>`
			`<h3>Pass by Copy</h3>`
			`<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>`
			`<h3>Pass by Reference</h3>`
			`<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>`
			`<h3>What's the Implication?</h3>`
			`<p>If you change the primitive in a method, it doesn't actually change the value of the variable.</p>`
			`<p>If you pass in an array and change it in the method, it has been permanently changed outside the method as well.</p>`
			`<h3>How do I make it so I can't change my array by accident?</h3>`
			`<p>Use the <code>final</code>keyword in the method header</p>`
			`<pre><code class="language-java">public static void printAll(final int[] array) {`
			`for (int i = 0; i < array.length; i++) {`
			`System.out.println("Number " + (i + 1) + " is " + array[i])`
			`}`
			`}</code></pre>`
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