JAVA設計模式之工廠模式之工廠方法模式

import factoryPattern.factoryMethod.service.Shape;

/*
 * 創建接口，同種產品的不同系列分別實現該工廠接口(比如三角形、矩形、橢圓均同 爲形狀產品)。
 * 消費產品系列時只需調用該系列的工廠方法生產產品就可以了，這樣避免了簡單工廠方法的缺點:
 * 一旦該工廠方法出現故障，其他產品受到影響 
 */
public interface ShapeFactory {

	public  Shape getShape();
}

public class CircleFactory implements ShapeFactory{

	@Override
	public Shape getShape() {
		
		return new Circle();
	}

}

public class RectangleFactory implements ShapeFactory{

	@Override
	public Shape getShape() {
		
		return new Rectangle();
	}

}

public class SquareFactory implements ShapeFactory{

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

}

public interface Shape {

	String draw();
}

public class Circle implements Shape{

	@Override
	public String draw() {
		return "Circle draw";
	}	
}

public class Rectangle implements Shape {

	@Override
	public String draw() {
		return "Rectangle draw";
	}
	
}

public class Square implements Shape{

	@Override
	public String draw() {
		return "Square draw";
	}
}

public class ShapeFactoryTest {

	@Test
	public void testShapeFactory(){
		ShapeFactory circleFactory=new CircleFactory();
		ShapeFactory squareFactory=new SquareFactory();
		
		Shape circle=circleFactory.getShape();
		Shape square=squareFactory.getShape();
		
		assertEquals("Circle draw",circle.draw());
		assertEquals("Square draw",square.draw());
	}
	
}