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JavaFX Classes

The JavaFX API and provides us with a large number of classes that we use in our applications, however we can also define your own classes, this section will concentrate on defining a few classes and see new variants provides us the language.


A class is declared using the class keyword and class name class


Address
{var street: String;
var city: String;
var state: String;
var zip: String;}


can see here we are defining the Address class which consists of 4 variables that now

not define any visibility modifiers (Next issue;)) will default visibility is known as "script-only." This also applies to the class because they do not define their visibility modifier and may only be used from the same script. A very important detail is that classes do not have builders how to create an instance of some sort is by the name of the class and open "{...}" and initialize the properties we want, we can imagine this as in the closure we have a Map property and then assign values \u200b\u200b

 def address = { Street Address: 1 Main Street ";  city," Santa Clara "  state: "CA"; 
 zip: "95050"} 
 
 
 
 Above is the creation of an instance of the Address class, which initializes its various properties. Abstract Classes 
  

As in the Java language can define a class as abstract, remember that a class is abstract if it is defined as abstract class
because it holds one or more methods (functions if we refer to JavaFX), and if not have them and just mark the class as abstract.

  
 abstract class Account {var 
 accountNum: Integer; 
 var balance: Number; 
 getBalance 
 function (): Number {
 return balance;}  

function deposit (amount: Number): Void { balance + = Amount; } function
Withdraw (amount: Number): Void { balance -= Amount;
}}

    Here we just define our abstract class that provides all necessary functionality but for some reason we decided to mark it as abstract as So we do not care for example, but it is good to clarify that this class could be concrete. To make a class inherit from another we use the word extends 
 and after that as we add more properties or writing functions or what we need to do. 
 
 
 
 SimpleAccount 
 class extends Account {var 
 hasOverDraftProtection: Boolean; 
 override function 
 Withdraw (amount: Number): Void {
 if (balance-Amount \u0026lt;0 and hasOverDraftProtection) {
 balance = 0;} else {
 
 balance -= Amount; / / may result in negative account balance! 
 
}}} 
  

SimpleAccount In the example we see how to implement inheritance, we can also see the override switch

which is responsible to overwrite a function within the same function we are overwriting see how we use super to access the implementation of parent class.

  far we have found many differences with Java but it's time to talk Mixin class. Mixin Classes 
 
 
 
 
 mixin classes would be a mix of Java interfaces with abstract classes because they are left to implement and define the implementation of the functions, but we can not instantiate mixin classes. 
 
 Example: 
   
  
  
  
 package classpkg;   

mixin class MyNameMixin {
var firstName = "John"; var lastName = "Doe"; function printName(){
println("My name is: {firstName} {lastName}");
}
}
mixin class MyAddressMixin { var address = "1 Main Street, Anytown USA";
function printAddress(){
println("My address is: {address}");
}
}

 class MyContact extends MyNameMixin, MyAddressMixin { }   
 def myContact = MyContact{}; 
 myContact.printName(); 
 myContact.printAddress(); 
  
  
  
 In this example we are defining two mixin classes which have properties and functions, and although you can not create new instances of them can use it to achieve multiple inheritance. 
 
 I leave a list of rules on classes: 
 
 
 Mixin classes can not be instantiated 
 
 Mixin classes can only inherit from classes or interfaces Mixin 
 
 Mixin classes can extend any number of interfaces or classes 
 Mixin 
 JavaFX classes can only inherit from a class because JavaFX is based on Java 
 
 Well with this we end this post, the next topic will be on the visibility modifiers, I hope you have understood everything and have not been questions, discuss anything 
 
 Greetings