JAVA设计模式之工厂模式之工厂方法模式

import factoryPattern.factoryMethod.service.Shape;

/*
* 创建接口，同种产品的不同系列分别实现该工厂接口(比如三角形、矩形、椭圆均同 为形状产品)。
* 消费产品系列时只需调用该系列的工厂方法生产产品就可以了，这样避免了简单工厂方法的缺点:
* 一旦该工厂方法出现故障，其他产品受到影响
*/
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());
}

}