<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<root>

<name>implements</name>

<category>Structure</category>

<subcategory></subcategory>

<usage>Web &amp; Application</usage>

<example>

<image></image>

<code><![CDATA[

interface Dot {

void move();

void display();

}

class CircleDot implements Dot {

float x = 50;

float y = 50;

void move() {

x = x + random(-1, 1);

}

void display() {

ellipse(x, y, 16, 16);

}

}

class SquareDot implements Dot {

float x = 50;

float y = 50;

void move() {

y = y + random(-1, 1);

}

void display() {

rect(x, y, 16, 16);

}

}

]]></code>

</example>

<description><![CDATA[

Implements an <i>interface</i> or group of <i>interfaces</i>. Interfaces are used to establish a protocol between classes; they establish the form for a class (method names, return types, etc.) but no implementation. After implementation, an interface can be used and extended like any other class.<br />

<br />

Because Java doesn't allow extending more than one class at a time, you can create interfaces instead, so specific methods and fields can be found in the class which implements it. A Thread is an example; it implements the "Runnable" interface, which means the class has a method called "public void run()" inside it.

]]></description>

<syntax></syntax>

<returns></returns>

<related>

extends

</related>

<availability>1.0</availability>

<type>Keyword</type>

<partof>PDE</partof>

<level>extended</level>

</root>