FlyWeight模式

来源：互联网发布：持仓异动指标源码编辑：程序博客网时间：2024/04/29 19:06

public interface Shape {    void draw();}

public class Circle implements Shape {    private String color;    private int x;    private int y;    private int radius;    public Circle(String color) {        this.color = color;    }    public String getColor() {        return color;    }    public void setColor(String color) {        this.color = color;    }    public int getX() {        return x;    }    public void setX(int x) {        this.x = x;    }    public int getY() {        return y;    }    public void setY(int y) {        this.y = y;    }    public int getRadius() {        return radius;    }    public void setRadius(int radius) {        this.radius = radius;    }    @Override    public void draw() {        System.out.println("Circle:Draw() [Color:" + color + ",x:" + x + ",y:"                + y + ", radius: " + radius);    }}

import java.util.HashMap;public class ShapeFactory {    private static final HashMap<String, Shape> circleMap = new HashMap<String, Shape>();    public static Shape getCircle(String color){        //获得圆        Circle circle = (Circle) circleMap.get(color);        //如果圆不存在的        if(circle == null){            circle = new Circle(color);            circleMap.put(color, circle);            System.out.println("Creating circle of color :"+color);        }        return circle;    }}

public class FlyweightPatternDemo {    /**     * 执行过程：     *   1、设置colors的颜色     *        * **/    private static final String colors[] = { "RED", "GREEN", "BLUE", "WHITE",            "BLACK" };    public static void main(String[] args) {        for (int i = 0; i < 20; i++) {            /**             * 获得随机颜色             * **/            Circle circle = (Circle) ShapeFactory.getCircle(getRandomColor());            circle.setX(getRandomX());            circle.setY(getRandomY());            circle.setRadius(100);            circle.draw();        }    }    /**     * 返回随机颜色     * @return     */    private static String getRandomColor() {        return colors[(int) (Math.random() * colors.length)];    }    private static int getRandomX() {        return (int) (Math.random() * 100);    }    private static int getRandomY() {        return (int) (Math.random() * 100);    }}

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