设计模式之桥接模式

桥接模式主要的场景是数据库连接

首先定义一个接口

public interface DrawAPI {
    public void drawCircle(int radius,int x,int y);
}

接口的不同的情景的实现

public class GreenCircle implements DrawAPI {
    @Override
    public void drawCircle(int radius, int x, int y) {
        System.out.println("绿色圆,圆心(" + x +","+ y +")");
    }
}

public class RedCircle implements DrawAPI {
    @Override
    public void drawCircle(int radius, int x, int y) {
        System.out.println("红色圆,圆心(" + x +","+ y +")");
    }
}

定义桥

public abstract class Shape {
    protected DrawAPI drawAPI;
    protected Shape(DrawAPI drawAPI){
        this.drawAPI = drawAPI;
    }
    public abstract void draw();
}

public class Circle extends Shape {
    private int x,y,radius;

    public Circle(int x,int y,int radius,DrawAPI drawAPI) {
        super(drawAPI);
        this.x = x;
        this.y = y;
        this.radius = radius;
    }

    @Override
    public void draw() {
        drawAPI.drawCircle(radius,x,y);
    }
}

通过持有接口对象的方式适应不同的场景

主函数测试:

public class Main {
    public static void main(String[] args) {
        Shape redCircle = new Circle(100,100,10,new RedCircle());
        Shape greenCircle = new Circle(100,100,10,new GreenCircle());
        redCircle.draw();
        greenCircle.draw();
    }
}