mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-09-19 22:25:12 -04:00
131 lines
4.9 KiB
HTML
131 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 20th</h1>
|
|
<h2>Reading a File</h2>
|
|
<p>You can get input from a file instead of from the terminal</p>
|
|
<pre><code class="language-java">FileInputStream fileIn = new FileInputStream("myFile.txt");
|
|
// Our familiar Scanner
|
|
Scanner scnr = new Scanner(fileIn);
|
|
// We can use our usual Scanner methods
|
|
String line = scnr.nextLine();
|
|
fileIn.close(); // Remember to close the file when you're finished with it!</code></pre>
|
|
<h3>Reviewing Scanner Methods</h3>
|
|
<p>To understand some of the Scanner methods we need to be aware of the "newline" character. This character is equivalent to the <code>Enter</code> button on the keyboard.</p>
|
|
<p><code>scnr.nextLine()</code> This get's all the characters in the buffer up to the newline character.</p>
|
|
<p><code>scnr.next()</code> Grabs the characters in the next "token". Tokens are usually separated by any whitespace type character (spaces, enters, tabs, etc.)</p>
|
|
<h2>Writing to a File</h2>
|
|
<p>Prints information to a file instead of to the screen</p>
|
|
<pre><code class="language-java">FileOutputStream fileOut = new FileOutputStream("myOutfile.txt");
|
|
PrintWriter out = new PrintWriter(fileOut);
|
|
out.println("Print this as the first line.");
|
|
out.flush(); // Pushes the file changes to the file
|
|
fileOut.close(); // If you forget this then it won't remember your changes</code></pre>
|
|
<h2>Arrays</h2>
|
|
<p>Arrays are containers of fixed size. It contains a fixed number of values of the <strong>same type</strong>. (Ex: 10 integers, 2 strings, 5 booleans)</p>
|
|
<p>Declaration</p>
|
|
<pre><code class="language-java">int[] array; // This declares an integer array</code></pre>
|
|
<p>Initialization</p>
|
|
<pre><code class="language-java">array = new int[7]; // This states that this array can hold up to 7 integers</code></pre>
|
|
<p>Storing a value in an array</p>
|
|
<ul>
|
|
<li>Square bracket notation is used</li>
|
|
</ul>
|
|
<pre><code class="language-java">int[] array = new int[7];
|
|
array[0] = 5; // Stores 5 into the first slot</code></pre>
|
|
<p>Now let us attempt to retrieve the value</p>
|
|
<pre><code class="language-java">int temp = array[0];
|
|
System.out.println(temp); // Prints "5"</code></pre>
|
|
<h3>Traversing an Array</h3>
|
|
<p>Let's say we have the following array</p>
|
|
<pre><code class="language-java">int[] numbers = {3, 5, 2, 7, 9};</code></pre>
|
|
<p>Let's print out each of the values in the array</p>
|
|
<pre><code class="language-java">for (int i = 0; i < numbers.length; i++) {
|
|
System.out.print("value in " + i " is " + numbers[i]);
|
|
}</code></pre>
|
|
<h3>Finding the maximum value in an Array</h3>
|
|
<pre><code class="language-java">int highest = numbers[0];
|
|
for (int i = 0; i < numbers.length; i++) {
|
|
if (numbers[i] > highest) {
|
|
highest = numbers[x];
|
|
}
|
|
}</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>
|