mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-12-23 08:32:25 +00:00
162 lines
5.6 KiB
HTML
162 lines
5.6 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>Final Review December 6</h1>
|
|
<h2>Classes</h2>
|
|
<p>Here is how you can create a class called "Employee" with a non-default constructor (a constructor that takes parameters) and a getter and setter</p>
|
|
<pre><code class="language-java">public class Employee {
|
|
// Our private variables
|
|
private String name;
|
|
private double salary;
|
|
// Non-default constructor
|
|
public Employee(String name, double salary) {
|
|
this.name = name;
|
|
this.salarly = salary;
|
|
}
|
|
// This is a getter
|
|
public string getName() {
|
|
return name;
|
|
}
|
|
public double setSalarly(double salary) {
|
|
this.salary = salary;
|
|
}
|
|
}</code></pre>
|
|
<h2>For Loops + Arrays</h2>
|
|
<p>For loops are constructed in the following way</p>
|
|
<p><code>for (initialization; condition to stop; increment to get closer to condition to stop)</code></p>
|
|
<pre><code class="language-java">//Assume an array with variable name array is declared before
|
|
for (int i = 0; i < array.length; i++) {
|
|
// This code will loop through every entry in the array
|
|
}</code></pre>
|
|
<p>Note that you don't always have to start from zero, you can start anywhere from the array.</p>
|
|
<h2>For Loops + Arrays + Methods</h2>
|
|
<p>This is an example of how you can take in an array in a method</p>
|
|
<pre><code class="language-java">public static boolean isEven(int[] array) { // <-- Note the int[] array
|
|
for (int i = 0; i < array.length; i++) { // Iterate through the entire array
|
|
// If you find an odd number, return false
|
|
if (array[i] % 2 == 1) {
|
|
return false;
|
|
}
|
|
}
|
|
// If you didn't find any odd numbers, return true
|
|
return true;
|
|
}</code></pre>
|
|
<h2>File I/O</h2>
|
|
<p>Let's say that you have the following file</p>
|
|
<pre><code>4
|
|
chicken
|
|
3
|
|
salad</code></pre>
|
|
<p>And you want to make it so that you take the number, and print the word after it a certain number of times. For this example we would want to see the following</p>
|
|
<pre><code class="language-java">chicken chicken chicken chicken
|
|
salad salad salad</code></pre>
|
|
<p>Here is the code to write it</p>
|
|
<pre><code class="language-java">public static void printStrings() {
|
|
FileInputStream file = new FileInputStream("stuff.txt"); // File contents are in stuff.txt
|
|
Scanner scnr = new Scanner(file); // Scanner takes in a file to read
|
|
while (scnr.hasNext()) { // While there are still stuff in the file to read
|
|
int number = scnr.nextInt(); // Grab the number
|
|
String word = scnr.next(); // Grab the word after the number
|
|
// Print the word number times
|
|
for (int i = 0; i < number; i++) {
|
|
System.out.print(word);
|
|
}
|
|
// Put a new line here
|
|
System.out.println();
|
|
}
|
|
|
|
}</code></pre>
|
|
<h2>Recursion</h2>
|
|
<p>Look at handout and carefully trace recursion problems</p>
|
|
<h2>2D Arrays</h2>
|
|
<p>Declare a 2D int array with 4 rows and 7 columns</p>
|
|
<pre><code class="language-java">int[][] dataVals = new int[4][7];</code></pre>
|
|
<p>A 2D array with 4 rows and 7 columns has 7 * 4 = 28 entries.</p>
|
|
<p>If you want to sum up all the numbers in a 2 dimensional array, do the following</p>
|
|
<pre><code class="language-java">// Assume numbers is declared beforehand
|
|
int sum = 0;
|
|
for (int i = 0; i < numbers.length; i++) { // Loop through every row in the 2D array
|
|
for (int j = 0; j < numbers[i].length; j++) { // Loop through every column in a row
|
|
// This code now looks at one entry in a 2D array
|
|
sum += numbers[i][j];
|
|
}
|
|
}</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>
|