简单工厂模式学习

工厂模式（Factory Pattern）又被称为静态工厂方法模式，主要实现是有工厂类，产品抽象类以及具体产品类组成。其中工厂类的主要作用在于针对不同的

产品生产在抽象类引用下的具体产品的实例。例如生产不同的形状时，有抽象类Shape，具体产品类Rectangle、Circle、Triangle等，以及实例化各个具体产品

并向外提供引用的工厂类。

简单工厂模式

先创建一个抽象产品出来的接口Shape只有一个功能

public interface{

void onDraw();

void setBound(int... bounds);

}

创建具体产品的类

public class Rectangle implements Shape{
    
    private int width;
    private int height;
    
    @Override
    public void onDraw() {
        System.out.println("draw rectangle:"+width+"*"+height);
    }

   @Override

   public void setBound(int... bounds){
      this.width =bounds[0];
      this.height =bounds[1];
   }

}

public class Triangle implements Shape{
    
    private int bound1;
    private int bound2;
    private int bound3;
    
    @Override
    public void onDraw() {
        System.out.println("draw triangle:"+bound1+"*"+bound2+"*"+bound3);
    }

   @Override

   public void setBound(int... bounds){
      this.bound1=bounds[0];
      this.bound2=bounds[1];
      this.bound3=bounds[2];
   }

}

public class Circle implements Shape{
    
    private int radium;
    
    @Override
    public void onDraw() {
        System.out.println("draw Circle:"+radium);
    }

   @Override
   public void setBound(int... bounds) {
     this.radium = bounds[0];
   }

}

创建工厂类

public class ShapeFactory {
    
    /**
     *@param type 0:rectangle 1:triangle 2:circle
     * */
    public Shape creteShape(int type){
        Shape shape = null;
        switch (type){
            case 0:
                shape = new Rectangle();
                break;
            case 1:
                shape = new Triangle();
                break;
            case 2:
                shape = new Circle();
                break;
        }
        return shape;
    }
    
}

创建工厂实例类

public class FactoryDemo {
    
    private ShapeFactory mShapeFactory;
    
    public FactoryDemo(){
        mShapeFactory = new ShapeFactory();
    }
    
    public void onDrawrect(int width,int height){
        Shape rectangle =  mShapeFactory.creteShape(0);
        rectangle.setBound(width,height);
        rectangle.onDraw();
    }
    
    public void onDrawTriangle(int bound1,int bound2,int bound3){
        Shape triangle =  mShapeFactory.creteShape(1);
        triangle.setBound(bound1,bound2,bound3);
        triangle.onDraw();
    }
    
    public void onCircle(int radium){
        Shape circle =  mShapeFactory.creteShape(2);
        circle.setBound(radium);
        circle.onDraw();
        
    }
    
}

自此就完成了图形的简单工厂模式。可以在main中调用工厂实例来实现。

这里用了android的activity

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    FactoryDemo demo = new FactoryDemo();
    demo.onDrawrect(10,20);
    demo.onCircle(6);
    demo.onDrawTriangle(3,4,5);
}

结果如下

简单工厂模式

简单工厂模式

简单工厂模式学习

相关推荐