Simple factory model (3)

The factory pattern is the class or method responsible for generating other objects.

Type 1 implementation

For example, we have some classes, all of which inherit from the vehicle class:

interface Vehicle
{
    public function drive();
}

class Car implements Vehicle
{
    public function drive()
    {
        echo '汽车靠四个轮子滚动行走。';
    }
}

class Ship implements Vehicle
{
    public function drive()
    {
        echo '轮船靠螺旋桨划水前进。';
    }
}

class Aircraft implements Vehicle
{
    public function drive()
    {
        echo '飞机靠螺旋桨和机翼的升力飞行。';
    }
}

Create another factory class, dedicated to the creation of the class:

class VehicleFactory
{
    public static function build($className = null)
    {
        $className = ucfirst($className);
        if ($className && class_exists($className)) {
            return new $className();
        }
        return null;
    }
}

The factory class uses a static method to create other classes, which can be used in the client as follows:

VehicleFactory::build('Car')->drive();
VehicleFactory::build('Ship')->drive();
VehicleFactory::build('Aircraft')->drive();

Eliminates the need to newwork every time .

2 Solve

 

 

Reference materials:

1. Design Patterns: The Simple Factory Pattern
2. Understanding the Factory Method Design Pattern
3. Design Patterns: Summary and Differences of Simple Factory, Factory Method, and Abstract Factory