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137 lines
4.3 KiB
HTML
137 lines
4.3 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<meta name="author" content="Fredrik Danielsson, http://lostkeys.se">
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<title>Brandon Rozek</title>
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</head>
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<body>
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<aside class="main-nav">
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<nav>
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Home
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Courses
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Lab Aide
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Presentations
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Research
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Transcript
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<main class="main-content">
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<article class="article">
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<h1>October 18th</h1>
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<h2>ArrayLists in classes</h2>
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<pre><code class="language-java">public class Numbers {
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private ArrayList<Integer> used;
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private ArrayList<Integer> unused;
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numbers () {
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// Debug: System.out.println("1. Constructor Entry Point");
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used = new ArrayList<Integer>();
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unused = new ArrayList<Integer>();
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// Debug: System.out.println("2, Constructor Size of ArrayLists" + used.size() + " " + unused.size())
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}
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// Adds the numbers 1-5 into the used ArrayList
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public void fillUsedArrayList() {
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for (int i = 0; i < 5; i++) {
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used.add(i + 1);
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}
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}
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// Move an item from the unused ArrayList to the used ArrayList
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public int moveIt(int index) {
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int temp = used.get(index);
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unused.add(temp);
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// Debug: System.out.println("Adding to used array:" + (i + 1));
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used.remove(index);
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return temp;
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}
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// The method below is created for debugging purposes
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public void printBothArrayLists() {
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// Print the used arraylist
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System.out.println("Used ArrayList");
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for (int i = 0; i < used.size(); i++) {
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System.out.println(used.get(i));
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}
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// Print the unused arraylist
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System.out.println("Unused ArrayList");
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for (int i = 0; i < unused.size(); i ++) {
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System.out.println(unused.get(i));
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}
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}
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}</code></pre>
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<p>Recall that you can compile the code above but you cannot run it. To run code, you must have a main method.</p>
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<h2>NumberTester</h2>
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<pre><code class="language-java">public class NumberTester {
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public static void main(String[] args) {
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Numbers list;
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list = new Numbers();
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list.fillUsedArrayList();
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list.printBothArrayLists();
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}
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}</code></pre>
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<h2>Difference between Array and ArrayList</h2>
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<p>An Array is a <strong>static</strong> structure of contiguous memory of a single type.</p>
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<p>An ArrayList is a <strong>dynamic</strong> structure of contiguous memory of a single type </p>
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<p>To get the size of an array you use <code>.length</code></p>
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<p>To get the size of an ArrayList you use <code>.size()</code></p>
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</article>
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