Java实现(07)——桥接模式(Bridge Pattern)

桥接模式用于连接两个不相干的抽象实现，这种模式中存在一个当做桥梁的接口，本例展示可以用不同的颜色画一个圆，但是提供相同的抽象接口。



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

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 + "]");
}
}

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: " + ", " + y + "]");
}
}

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);
}
}

public class Demo {
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();
}
}

输出：
Drawing Circle[ color: red, radius: 10, x: 100, 100]

Drawing Circle[ color: green, radius: 10, x: , 100]