1、画圆接口
package Bridge;
public interface DrawAPI {
public void drawCircle(int radius, int x, int y);
}
2、画圆接口实现类——绿圆
package Bridge;
public class GreenCircle implements DrawAPI{
@Override
public void drawCircle(int radius, int x, int y) {
System.out.println("Drawing Circle[ color: green, radius: "
+ radius +", x: " +x+", "+ y +"]");
}
}
3、画圆接口实现类——红圆
package Bridge;
public class RedCircle implements DrawAPI{
@Override
public void drawCircle(int radius, int x, int y) {
System.out.println("Drawing Circle[ color: red, radius: "
+ radius +", x: " +x+", "+ y +"]");
}
}
4、形状父类
package Bridge;
public abstract class Shape {
public abstract void draw();
}
5、形状子类
package Bridge;
public class Circle extends Shape{
protected DrawAPI drawAPI;
private int x, y, radius;
public Circle(int x, int y, int radius, DrawAPI drawAPI) {
this.drawAPI = drawAPI;
this.x = x;
this.y = y;
this.radius = radius;
}
public void draw(){
drawAPI.drawCircle(radius, x, y);
}
}
在Circle类中引用DrawAPI 的对象，即可使用DrawAPI 的实现类：
GreenCircle 和RedCircle ，完成桥接
6、测试类
package Bridge;
public class BridgePatternDemo {
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(); //调用了RedCircle的draw()
greenCircle.draw(); //调用了GreenCircle的draw()
}
}
测试结果：
Drawing Circle[ color: red, radius: 10, x: 100, 100]
Drawing Circle[ color: green, radius: 10, x: 100, 100]
————————————————————————————————————————————————
修改上面第四个和第五个Shape类和Circle类，效果相同：
4、形状父类
package Bridge;
public abstract class Shape {
protected DrawAPI drawAPI;
protected Shape(DrawAPI drawAPI){
this.drawAPI = drawAPI;
}
public abstract void draw();
}
在Shape类中引用DrawAPI 的对象，即可使用DrawAPI 的实现类：
GreenCircle 和RedCircle ，完成桥接
5、形状子类
package Bridge;
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;
}
public void draw(){
drawAPI.drawCircle(radius, x, y);
}
}