java 桥模式（Bridge Pattern)详解

interface Printer {  public void print(int radius, int x, int y);}//from www.j a v a2 s . c omclass ColorPrinter implements Printer {  @Override  public void print(int radius, int x, int y) {   System.out.println("Color: " + radius +", x: " +x+", "+ y +"]");  }}class BlackPrinter implements Printer {  @Override  public void print(int radius, int x, int y) {   System.out.println("Black: " + radius +", x: " +x+", "+ y +"]");  }}abstract class Shape {  protected Printer print;  protected Shape(Printer p){   this.print = p;  }  public abstract void draw(); }class Circle extends Shape {  private int x, y, radius;  public Circle(int x, int y, int radius, Printer draw) {   super(draw);   this.x = x;    this.y = y;    this.radius = radius;  }  public void draw() {   print.print(radius,x,y);  }}public class Main {  public static void main(String[] args) {   Shape redCircle = new Circle(100,100, 10, new ColorPrinter());   Shape blackCircle = new Circle(100,100, 10, new BlackPrinter());   redCircle.draw();   blackCircle.draw();  }}