路一步步走>> 设计模式七：桥接-Bridge

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理解的不是很深 。用到在看。

package com.test.DPs.JieGou.Bridge;
/**
 * 结构型：Bridge-桥接		桥接：作用面为 对象
 * 
 * 用途：将抽象部分与它的实现部分分离，使它们都可以独立的变化。
 */
interface DrawAPI{
	public void drawCircle(int radius, int x, int y);
}
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:"+y+"]");
	}
}
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:"+y+"]");
	}
}
abstract class Shape{
	protected DrawAPI drawAPI;
	protected Shape(DrawAPI drawAPI){
		this.drawAPI = drawAPI;
	}
	public abstract void draw();
}
/**
 * Circle类将DrawAPI和Shape类进行了桥接。
 *    Shepe类给出了参数，DrawAPI依据参数进行了实现。
 * 理解：桥接两边分别是：抽象和重载
 */
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);
	}
}

//客户端使用代码
/*
	Shape redCircle = new Circle(100,100, 10, new RedCircle());
	Shape greenCircle = new Circle(100,100, 10, new GreenCircle());
	redCircle.draw();
	greenCircle.draw()
*/