mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-11-30 06:13:29 -05:00
149 lines
4.9 KiB
HTML
149 lines
4.9 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta charset="utf-8" />
|
|
<meta name="author" content="Brandon Rozek">
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
|
<meta name="robots" content="noindex" />
|
|
<title>Brandon Rozek</title>
|
|
<link rel="stylesheet" href="themes/bitsandpieces/styles/main.css" type="text/css" />
|
|
<link rel="stylesheet" href="themes/bitsandpieces/styles/highlightjs-github.css" type="text/css" />
|
|
</head>
|
|
<body>
|
|
|
|
<aside class="main-nav">
|
|
<nav>
|
|
<ul>
|
|
<li class="menuitem ">
|
|
<a href="index.html%3Findex.html" data-shortcut="">
|
|
Home
|
|
</a>
|
|
</li>
|
|
<li class="menuitem ">
|
|
<a href="index.html%3Fcourses.html" data-shortcut="">
|
|
Courses
|
|
</a>
|
|
</li>
|
|
<li class="menuitem ">
|
|
<a href="index.html%3Flabaide.html" data-shortcut="">
|
|
Lab Aide
|
|
</a>
|
|
</li>
|
|
<li class="menuitem ">
|
|
<a href="index.html%3Fpresentations.html" data-shortcut="">
|
|
Presentations
|
|
</a>
|
|
</li>
|
|
<li class="menuitem ">
|
|
<a href="index.html%3Fresearch.html" data-shortcut="">
|
|
Research
|
|
</a>
|
|
</li>
|
|
<li class="menuitem ">
|
|
<a href="index.html%3Ftranscript.html" data-shortcut="">
|
|
Transcript
|
|
</a>
|
|
</li>
|
|
</ul>
|
|
</nav>
|
|
</aside>
|
|
<main class="main-content">
|
|
<article class="article">
|
|
<h1>Lecture for February 8th</h1>
|
|
<h2>Switch Statements</h2>
|
|
<p>Another way to perform multiway branching. Comparing a variable and constant values (<code>String</code>, <code>int</code>, <code>char</code>)</p>
|
|
<p>Switch statements cannot be used with <code>boolean</code>, <code>double</code>, or <code>float</code>s</p>
|
|
<h3>Syntax</h3>
|
|
<pre><code class="language-java">switch (variable) {
|
|
case value1:
|
|
// Do something
|
|
break;
|
|
case value2:
|
|
// Do something else
|
|
break;
|
|
//...
|
|
default:
|
|
// If all else fails do this
|
|
break;
|
|
}</code></pre>
|
|
<p><code>case</code> is a reserved word that means "when our variable in consideration is equal to..."</p>
|
|
<p>If you forget the <code>break</code> keyword, then the program will keep doing the work of all the statements until it hits a <code>break</code> keyword.</p>
|
|
<h3>Example Switch Syntax</h3>
|
|
<pre><code class="language-java">switch (birthday) {
|
|
case 1:
|
|
birthstone = "garnet";
|
|
break;
|
|
case 2:
|
|
birthstone = "amethyst";
|
|
break;
|
|
// ....
|
|
default:
|
|
System.out.println("Not valid");
|
|
break;
|
|
}</code></pre>
|
|
<h2>Comparing Strings Relationally</h2>
|
|
<p>Comparing strings are based on the ASCII value of characters</p>
|
|
<p>Sorting strings will result in strings being in alphabetical or reverse alphabetical order. The values of the strings are compared character by character from the left with each ASCII value.</p>
|
|
<p>To compare strings use the <code>compareTo()</code> method. Here is the format of the call</p>
|
|
<pre><code class="language-java">str1.compareTo(str2)</code></pre>
|
|
<p>This returns a <em>negative number</em> when <code>str1</code> is less than <code>str2</code></p>
|
|
<p>This returns <code>0</code> when <code>str1</code> is equal to <code>str1</code></p>
|
|
<p>This returns a <em>positive number</em> when <code>str1</code> is greater than <code>str2</code></p>
|
|
<h3>Example</h3>
|
|
<pre><code class="language-java">String a = "apple";
|
|
String b = "banana";
|
|
|
|
int x = a.compareTo(b); // x = -1
|
|
|
|
int y = b.compareTo(a); // y = 1</code></pre>
|
|
<h2>Ternary Operator</h2>
|
|
<p>With a ternary operator, you can shorten statements where a value is determined by an if statement</p>
|
|
<pre><code class="language-java">String output = "";
|
|
if (movieRating > 4) {
|
|
output = "Fan favorite";
|
|
} else {
|
|
output = "Alright";
|
|
}</code></pre>
|
|
<p>Is equivalent to</p>
|
|
<pre><code class="language-java">String output = "";
|
|
output = (movieRating > 4)? "Fan favorite": "Alright";</code></pre>
|
|
<h3>Another Example</h3>
|
|
<pre><code class="language-java">double shipping;
|
|
if (isPrimeMember) {
|
|
shipping = 0;
|
|
} else {
|
|
shipping = 3.99;
|
|
}</code></pre>
|
|
<p>Is equivalent to</p>
|
|
<pre><code class="language-java">double shipping = (isPrimeMember)? 0: 3.99;</code></pre>
|
|
</article>
|
|
</main>
|
|
|
|
<script src="themes/bitsandpieces/scripts/highlight.js"></script>
|
|
<script src="themes/bitsandpieces/scripts/mousetrap.min.js"></script>
|
|
<script type="text/x-mathjax-config">
|
|
MathJax.Hub.Config({
|
|
tex2jax: {
|
|
inlineMath: [ ['$','$'], ["\\(","\\)"] ],
|
|
processEscapes: true
|
|
}
|
|
});
|
|
</script>
|
|
|
|
<script type="text/javascript"
|
|
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML">
|
|
</script>
|
|
<script>
|
|
hljs.initHighlightingOnLoad();
|
|
|
|
document.querySelectorAll('.menuitem a').forEach(function(el) {
|
|
if (el.getAttribute('data-shortcut').length > 0) {
|
|
Mousetrap.bind(el.getAttribute('data-shortcut'), function() {
|
|
location.assign(el.getAttribute('href'));
|
|
});
|
|
}
|
|
});
|
|
</script>
|
|
|
|
</body>
|
|
</html>
|