270 lines
8.4 KiB
HTML
270 lines
8.4 KiB
HTML
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<title>ArrayList | reference | Processing.js</title>
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<span class="tagline">a port of the Processing Visualization Language</span>
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<table cellpadding="0" cellspacing="0" border="0" class="ref-item">
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<tr class="name-row">
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<th scope="row">Name</th>
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<td><h3>ArrayList</h3></td>
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</tr>
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<tr class="">
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<th scope="row">Examples</th>
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<td><div class="example"><pre>// This is a code fragment that shows how to use an ArrayList.
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// It won't compile because it's missing the Ball class.
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ArrayList balls;
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void setup() {
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size(200, 200);
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balls = new ArrayList(); // Create an empty ArrayList
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balls.add(new Ball(width/2, 0, 48)); // Start by adding one element
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}
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void draw() {
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background(255);
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// With an array, we say balls.length, with an ArrayList,
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// we say balls.size(). The length of an ArrayList is dynamic.
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// Notice how we are looping through the ArrayList backwards, this
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// is because we are deleting elements from the list
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for (int i = balls.size()-1; i >= 0; i--) {
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// An ArrayList doesn't know what it is storing so we have
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// to cast the object coming out
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Ball ball = (Ball) balls.get(i);
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ball.move();
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ball.display();
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if (ball.finished()) {
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// Items can be deleted with remove()
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balls.remove(i);
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}
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}
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}
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void mousePressed() {
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// A new ball object is added to the ArrayList, by default to the end
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balls.add(new Ball(mouseX, mouseY, ballWidth));
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}</pre></div></td>
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</tr>
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<tr class="">
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<th scope="row">Description</th>
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<td>An <b>ArrayList</b> stores a variable number of objects. This is similar to making an array of objects, but with an <b>ArrayList</b>, items can be easily added and removed from the ArrayList and it is resized dynamically. This can be very convenient, but it's slower than making an array of objects when using many elements.
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<br /><br />
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An ArrayList is a resizable-array implementation of the Java List interface. It has many methods used to control and search its contents. For example, the length of the <b>ArrayList</b> is returned by its <b>size()</b> method, which is an integer value for the total number of elements in the list. An element is added to an <b>ArrayList</b> with the <b>add()</b> method and is deleted with the <b>remove()</b> method. The <b>get()</b> method returns the element at the specified position in the list. (See the above example for context.)
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<br /><br />
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For a list of the numerous <b>ArrayList</b> features, please read the <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/ArrayList.html">Java reference description</a>.</td>
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</tr>
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<tr class="">
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<th scope="row"><!--*-->Constructor<!--*--></th>
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<td><pre>ArrayList()
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ArrayList(<kbd>initialCapacity</kbd>)</pre></td>
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</tr>
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<tr class="">
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<th scope="row">Parameters</th>
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<td><table cellpadding="0" cellspacing="0" border="0">
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<tr class="">
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<th scope="row">initialCapacity</th>
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<td>int: defines the initial capacity of the list, it's empty by default</td>
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</tr>
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</table></td>
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</tr>
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<tr class="">
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<th scope="row">Usage</th>
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<td>Web & Application</td>
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</tr>
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<p>This reference is licensed under the CC BY-NC-SA 2.0 license:</p>
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Processing is an open visualization language developed by
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and originally ported to Javascript by
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