JAVA工厂模式-案例

Myth丶恋晨 2024-03-27 19:24 8阅读 0赞

## Java工厂模式 ##

// Shape接口  
    public interface Shape {  
        void draw();  
    }  
      
    // Circle类，实现了Shape接口  
    public class Circle implements Shape {  
        @Override  
        public void draw() {  
            System.out.println("Draw Circle");  
        }  
    }  
      
    // Square类，实现了Shape接口  
    public class Square implements Shape {  
        @Override  
        public void draw() {  
            System.out.println("Draw Square");  
        }  
    }  
      
    // Rectangle类，实现了Shape接口  
    public class Rectangle implements Shape {  
        @Override  
        public void draw() {  
            System.out.println("Draw Rectangle");  
        }  
    }  
      
    // Shape工厂类  
    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;  
        }  
    }  
      
    // 测试类  
    public class FactoryPatternDemo {  
        public static void main(String[] args) {  
            ShapeFactory shapeFactory = new ShapeFactory();  
      
            //获取 Circle 的对象，并调用它的 draw 方法  
            Shape shape1 = shapeFactory.getShape("CIRCLE");  
            shape1.draw();  
      
            //获取 Rectangle 的对象，并调用它的 draw 方法  
            Shape shape2 = shapeFactory.getShape("RECTANGLE");  
            shape2.draw();  
              
            //获取 Square 的对象，并调用它的 draw 方法  
            Shape shape3 = shapeFactory.getShape("SQUARE");  
            shape3.draw();  
        }  
    }