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Adds conversion table and example of a very basic component. Adds a link to the official Adobe ColdFusion developer reference.
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wboka 2015-10-09 08:43:12 -04:00
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@ -146,263 +146,176 @@ ColdFusion is a scripting language for web development.
</cfloop>
<hr />
<h1>Converting types</h1>
<style>
table.table th, table.table td {
border: 1px solid #000000;
padding: 2px;
}
table.table th {
background-color: #CCCCCC;
}
</style>
<table class="table" cellspacing="0">
<thead>
<tr>
<th>Value</th>
<th>As Boolean</th>
<th>As number</th>
<th>As date-time</th>
<th>As string</th>
</tr>
</thead>
<tbody>
<tr>
<th>"Yes"</th>
<td>TRUE</td>
<td>1</td>
<td>Error</td>
<td>"Yes"</td>
</tr>
<tr>
<th>"No"</th>
<td>FALSE</td>
<td>0</td>
<td>Error</td>
<td>"No"</td>
</tr>
<tr>
<th>TRUE</th>
<td>TRUE</td>
<td>1</td>
<td>Error</td>
<td>"Yes"</td>
</tr>
<tr>
<th>FALSE</th>
<td>FALSE</td>
<td>0</td>
<td>Error</td>
<td>"No"</td>
</tr>
<tr>
<th>Number</th>
<td>True if Number is not 0; False otherwise.</td>
<td>Number</td>
<td>See &#34;Date-time values&#34; earlier in this chapter.</td>
<td>String representation of the number (for example, &#34;8&#34;).</td>
</tr>
<tr>
<th>String</th>
<td>If "Yes", True <br>If "No", False <br>If it can be converted to 0, False <br>If it can be converted to any other number, True</td>
<td>If it represents a number (for example, &#34;1,000&#34; or &#34;12.36E-12&#34;), it is converted to the corresponding number.</td>
<td>If it represents a date-time (see next column), it is converted to the numeric value of the corresponding date-time object. <br>If it is an ODBC date, time, or timestamp (for example &#34;{ts &#39;2001-06-14 11:30:13&#39;}&#34;, or if it is expressed in a standard U.S. date or time format, including the use of full or abbreviated month names, it is converted to the corresponding date-time value. <br>Days of the week or unusual punctuation result in an error. <br>Dashes, forward-slashes, and spaces are generally allowed.</td>
<td>String</td>
</tr>
<tr>
<th>Date</th>
<td>Error</td>
<td>The numeric value of the date-time object.</td>
<td>Date</td>
<td>An ODBC timestamp.</td>
</tr>
</tbody>
</table>
<hr />
<h1>Components</h1>
<em>Code for reference (Functions must return something to support IE)</em>
<pre>
&lt;cfcomponent&gt;
&lt;cfset this.hello = "Hello" /&gt;
&lt;cfset this.world = "world" /&gt;
&lt;cffunction name="sayHello"&gt;
&lt;cfreturn this.hello & ", " & this.world & "!" /&gt;
&lt;/cffunction&gt;
&lt;cffunction name="setHello"&gt;
&lt;cfargument name="newHello" type="string" required="true" /&gt;
&lt;cfset this.hello = arguments.newHello /&gt;
&lt;cfreturn true /&gt;
&lt;/cffunction&gt;
&lt;cffunction name="setWorld"&gt;
&lt;cfargument name="newWorld" type="string" required="true" /&gt;
&lt;cfset this.world = arguments.newWorld /&gt;
&lt;cfreturn true /&gt;
&lt;/cffunction&gt;
&lt;cffunction name="getHello"&gt;
&lt;cfreturn this.hello /&gt;
&lt;/cffunction&gt;
&lt;cffunction name="getWorld"&gt;
&lt;cfreturn this.world /&gt;
&lt;/cffunction&gt;
&lt;/cfcomponent&gt;
</pre>
<cfset this.hello = "Hello" />
<cfset this.world = "world" />
<cffunction name="sayHello">
<cfreturn this.hello & ", " & this.world & "!" />
</cffunction>
<cffunction name="setHello">
<cfargument name="newHello" type="string" required="true" />
<cfset this.hello = arguments.newHello />
<cfreturn true />
</cffunction>
<cffunction name="setWorld">
<cfargument name="newWorld" type="string" required="true" />
<cfset this.world = arguments.newWorld />
<cfreturn true />
</cffunction>
<cffunction name="getHello">
<cfreturn this.hello />
</cffunction>
<cffunction name="getWorld">
<cfreturn this.world />
</cffunction>
<b>sayHello()</b>
<cfoutput><p>#sayHello()#</p></cfoutput>
<b>getHello()</b>
<cfoutput><p>#getHello()#</p></cfoutput>
<b>getWorld()</b>
<cfoutput><p>#getWorld()#</p></cfoutput>
<b>setHello("Hola")</b>
<cfoutput><p>#setHello("Hola")#</p></cfoutput>
<b>setWorld("mundo")</b>
<cfoutput><p>#setWorld("mundo")#</p></cfoutput>
<b>sayHello()</b>
<cfoutput><p>#sayHello()#</p></cfoutput>
<b>getHello()</b>
<cfoutput><p>#getHello()#</p></cfoutput>
<b>getWorld()</b>
<cfoutput><p>#getWorld()#</p></cfoutput>
```
<!--
////////////////////////////////////////
// Converting Data Types And Typecasting
////////////////////////////////////////
// Converting data
// Convert String To Integer
Integer.parseInt("123");//returns an integer version of "123"
// Convert Integer To String
Integer.toString(123);//returns a string version of 123
// For other conversions check out the following classes:
// Double
// Long
// String
// Typecasting
// You can also cast Java objects, there's a lot of details and deals
// with some more intermediate concepts. Feel free to check it out here:
// http://docs.oracle.com/javase/tutorial/java/IandI/subclasses.html
///////////////////////////////////////
// Classes And Functions
///////////////////////////////////////
System.out.println("\n->Classes & Functions");
// (definition of the Bicycle class follows)
// Use new to instantiate a class
Bicycle trek = new Bicycle();
// Call object methods
trek.speedUp(3); // You should always use setter and getter methods
trek.setCadence(100);
// toString returns this Object's string representation.
System.out.println("trek info: " + trek.toString());
} // End main method
} // End LearnJava class
// You can include other, non-public outer-level classes in a .java file
// Class Declaration Syntax:
// <public/private/protected> class <class name> {
// // data fields, constructors, functions all inside.
// // functions are called as methods in Java.
// }
class Bicycle {
// Bicycle's Fields/Variables
public int cadence; // Public: Can be accessed from anywhere
private int speed; // Private: Only accessible from within the class
protected int gear; // Protected: Accessible from the class and subclasses
String name; // default: Only accessible from within this package
// Constructors are a way of creating classes
// This is a constructor
public Bicycle() {
gear = 1;
cadence = 50;
speed = 5;
name = "Bontrager";
}
// This is a constructor that takes arguments
public Bicycle(int startCadence, int startSpeed, int startGear,
String name) {
this.gear = startGear;
this.cadence = startCadence;
this.speed = startSpeed;
this.name = name;
}
// Function Syntax:
// <public/private/protected> <return type> <function name>(<args>)
// Java classes often implement getters and setters for their fields
// Method declaration syntax:
// <scope> <return type> <method name>(<args>)
public int getCadence() {
return cadence;
}
// void methods require no return statement
public void setCadence(int newValue) {
cadence = newValue;
}
public void setGear(int newValue) {
gear = newValue;
}
public void speedUp(int increment) {
speed += increment;
}
public void slowDown(int decrement) {
speed -= decrement;
}
public void setName(String newName) {
name = newName;
}
public String getName() {
return name;
}
//Method to display the attribute values of this Object.
@Override
public String toString() {
return "gear: " + gear + " cadence: " + cadence + " speed: " + speed +
" name: " + name;
}
} // end class Bicycle
// PennyFarthing is a subclass of Bicycle
class PennyFarthing extends Bicycle {
// (Penny Farthings are those bicycles with the big front wheel.
// They have no gears.)
public PennyFarthing(int startCadence, int startSpeed){
// Call the parent constructor with super
super(startCadence, startSpeed, 0, "PennyFarthing");
}
// You should mark a method you're overriding with an @annotation.
// To learn more about what annotations are and their purpose check this
// out: http://docs.oracle.com/javase/tutorial/java/annotations/
@Override
public void setGear(int gear) {
gear = 0;
}
}
// Interfaces
// Interface declaration syntax
// <access-level> interface <interface-name> extends <super-interfaces> {
// // Constants
// // Method declarations
// }
// Example - Food:
public interface Edible {
public void eat(); // Any class that implements this interface, must
// implement this method.
}
public interface Digestible {
public void digest();
}
// We can now create a class that implements both of these interfaces.
public class Fruit implements Edible, Digestible {
@Override
public void eat() {
// ...
}
@Override
public void digest() {
// ...
}
}
// In Java, you can extend only one class, but you can implement many
// interfaces. For example:
public class ExampleClass extends ExampleClassParent implements InterfaceOne,
InterfaceTwo {
@Override
public void InterfaceOneMethod() {
}
@Override
public void InterfaceTwoMethod() {
}
}
// Abstract Classes
// Abstract Class declaration syntax
// <access-level> abstract <abstract-class-name> extends <super-abstract-classes> {
// // Constants and variables
// // Method declarations
// }
// Methods can't have bodies in an interface, unless the method is
// static. Also variables are NOT final by default, unlike an interface.
// Also abstract classes CAN have the "main" method.
// Abstract classes solve these problems.
public abstract class Animal
{
public abstract void makeSound();
// Method can have a body
public void eat()
{
System.out.println("I am an animal and I am Eating.");
// Note: We can access private variable here.
age = 30;
}
// No need to initialize, however in an interface
// a variable is implicitly final and hence has
// to be initialized.
private int age;
public void printAge()
{
System.out.println(age);
}
// Abstract classes can have main function.
public static void main(String[] args)
{
System.out.println("I am abstract");
}
}
class Dog extends Animal
{
// Note still have to override the abstract methods in the
// abstract class.
@Override
public void makeSound()
{
System.out.println("Bark");
// age = 30; ==> ERROR! age is private to Animal
}
// NOTE: You will get an error if you used the
// @Override annotation here, since java doesn't allow
// overriding of static methods.
// What is happening here is called METHOD HIDING.
// Check out this awesome SO post: http://stackoverflow.com/questions/16313649/
public static void main(String[] args)
{
Dog pluto = new Dog();
pluto.makeSound();
pluto.eat();
pluto.printAge();
}
}
-->
## Further Reading
The links provided here below are just to get an understanding of the topic, feel free to Google and find specific examples.
1. [Coldfusion Reference From Adobe](https://helpx.adobe.com/coldfusion/cfml-reference/topics.html)