02-FACTORY

FGJ: Create:2024/01/25 Update: (2024-10-24)

工厂模式 #

描述 #
工厂模式提供了一种创建对象的方式，而无需指定要创建的具体类。

工厂模式属于创建型模式，它在创建对象时提供了一种封装机制，将实际创建对象的代码与使用代码分离。
UML #

代码实现 #

public class Main {
    public static void main(String[] args) {

        ShapeFactory shapeFactory = new ShapeFactory();

        Shape shape1 = shapeFactory.getShape("CIRCLE");
        shape1.draw();

        Shape shape2 = shapeFactory.getShape("RECTANGLE");
        shape2.draw();

        Shape shape3 = shapeFactory.getShape("SQUARE");
        shape3.draw();
    }
}

public class ShapeFactory {

    //使用 getShape 方法获取形状类型的对象
    public Shape getShape(String shapeType){
        if(shapeType == null){ return null; }

        if(shapeType.equalsIgnoreCase("CIRCLE")){
            return new Circle();
        } else if(shapeType.equalsIgnoreCase("RECTANGLE")){
            return new Rectangle();
        } else if(shapeType.equalsIgnoreCase("SQUARE")){
            return new Square();
        }
        return null;
    }
}

public interface Shape {
    void draw();
}

public class Circle implements Shape {
    @Override
    public void draw() {
        System.out.println("Inside Circle::draw() method.");
    }
}

public class Rectangle implements Shape {
    @Override
    public void draw() {
        System.out.println("Inside Rectangle::draw() method.");
    }
}

public class Square implements Shape {
    @Override
    public void draw() {
        System.out.println("Inside Square::draw() method.");
}

Reference #
- https://www.runoob.com/design-pattern/factory-pattern.html

02-FACTORY

工厂模式 #

描述 #

UML #

代码实现 #

Reference #