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