桥接模式概述及Java实现示例

interface DrawingAPI {

void drawCircle(int x, int y, int radius);

}

class DrawingAPI1 implements DrawingAPI {

public void drawCircle(int x, int y, int radius) {

System.out.printf("API1.circle at %d:%d radius %d\n", x, y, radius);

}

}

class DrawingAPI2 implements DrawingAPI {

public void drawCircle(int x, int y, int radius) {

System.out.printf("API2.circle at %d:%d radius %d\n", x, y, radius);

}

}

abstract class Shape {

protected DrawingAPI drawingAPI;

protected Shape(DrawingAPI drawingAPI){
    this.drawingAPI = drawingAPI;
}

public abstract void draw();
public abstract void resizeByPercentage(double pct);

}

class CircleShape extends Shape {

private int x, y, radius;

public CircleShape(int x, int y, int radius, DrawingAPI drawingAPI) {
    super(drawingAPI);
    this.x = x;
    this.y = y;
    this.radius = radius;
}

public void draw() {
    drawingAPI.drawCircle(x, y, radius);
}

public void resizeByPercentage(double pct) {
    radius *= pct;
}

}