设计模式-工厂方法模式（三）

具体工厂类SquareFactory：

代码语言：javascript复制

public class SquareFactory implements ShapeFactory {
    private double side;

    public SquareFactory(double side) {
        this.side = side;
    }

    @Override
    public Shape createShape() {
        return new Square(side);
    }
}

具体工厂类RectangleFactory：

代码语言：javascript复制

public class RectangleFactory implements ShapeFactory {
    private double width;
    private double height;

    public RectangleFactory(double width, double height) {
        this.width = width;
        this.height = height;
    }

    @Override
    public Shape createShape() {
        return new Rectangle(width, height);
    }
}

客户端调用：

代码语言：javascript复制

public class Client {
    public static void main(String[] args) {
        // 创建具体工厂类的对象
        ShapeFactory circleFactory = new CircleFactory(5);
        ShapeFactory squareFactory = new SquareFactory(4);
        ShapeFactory rectangleFactory = new RectangleFactory(3, 4);

        // 调用工厂方法创建具体产品类的对象
        Shape circle = circleFactory.createShape();
        Shape square = squareFactory.createShape();
        Shape rectangle = rectangleFactory.createShape();

        // 使用具体产品类的对象
        System.out.println("Circle perimeter: "   circle.calculatePerimeter());
        System.out.println("Circle area: "   circle.calculateArea());
        System.out.println("Square perimeter: "   square.calculatePerimeter());
        System.out.println("Square area: "   square.calculateArea());
        System.out.println("Rectangle perimeter: "   rectangle.calculatePerimeter());
        System.out.println("Rectangle area: "   rectangle.calculateArea());
    }
}

运行结果：

代码语言：javascript复制

Circle perimeter: 31.41592653589793
Circle area: 78.53981633974483
Square perimeter: 16.0
Square area: 16.0
Rectangle perimeter: 14.0
Rectangle area: 12.0

设计模式

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