设计模式 -- 桥接模式（Bridge Pattern）

public interface Shape {
    public void bepaint(String color);
}

public abstract class Color {
    Shape shape;

    public void setShape(Shape shape) {
        this.shape = shape;
    }

    public abstract void draw();
}

public class Red extends Color {

    @Override
    public void draw() {
        shape.bepaint("红色");

    }
}

public class Green extends Color {

    @Override
    public void draw() {
        shape.bepaint("绿色");
    }
}

public class Circle implements Shape {

    @Override
    public void bepaint(String color) {
        System.out.println(color + "的圆形");
    }

}

public class Square implements Shape {

    @Override
    public void bepaint(String color) {
        System.out.println(color + "的正方形");
    }

}

public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Shape circle_shape = new Circle();
        Color red_color = new Red();
        red_color.setShape(circle_shape);
        red_color.draw();
        System.out.println("-----------------");
        Shape square_shape = new Square();
        red_color.setShape(square_shape);
        red_color.draw();
    }

}

红色的圆形
-----------------
红色的正方形