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面向对象的分析和设计
（重要思想）
谁拥有该数据，谁就对外提供操作这些数据的方法。
eg:
人在黑板上画图
person,blackboard,circle
draw(){
x,y-->radius
}
两块石头磨成一把石刀，石刀可以砍树，砍成木材，木材做成椅子
KnifeFactory.createKnife(Stone stone1,Stone stone2)
Stone
StoneKnife
tree
material = StoneKnife.cut(tree)
chair = ChairFactory.makeChair(material)
球从一根绳子的一端移动到另一端
绳子是用来提供小球移动的（所以~~绳子拥有数据，就得提供这些数据的方法）
class Rope{
private Point start;
private Point end;
public Rope(Point start,Point end){
this.start = start;
this.end = end;
}
public Point nextPoint(Point currentPoint){//提供数据方法
^
}
}
class Ball{
private Rope rope;
private Point currentPoint;
public Ball(Rope rope,startPoint){
this.rope = rope;
this.currentPoint = startPoint;
}
public void move(){
currentPoint = rope.nextPoint(currentPoint);
System.out.println("小球移动了"+currentPoint);
}
}
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思路分析：路上存在一个集合，集合里装着车，看红绿灯减少车；
12个灯，拐弯的灯是常亮的——枚举
public enum Lamp {
S2N("N2S","S2W",false),S2W("N2E","E2W",false),E2W("W2E","E2S",false),E2S("W2N","S2N",false),
N2S(null,null,false),N2E(null,null,false),W2E(null,null,false),W2N(null,null,false),
S2E(null,null,true),E2N(null,null,true),N2W(null,null,true),W2S(null,null,true);
private Lamp(String opposite,String next,boolean lighted){
this.opposite = opposite;
this.next = next;
this.lighted = lighted;
}
private boolean lighted;
private String opposite;
private String next;
public boolean isLighted(){
return lighted;
}
public void light(){
this.lighted = true;
if(opposite != null){
Lamp.valueOf(opposite).light();
}
System.out.println(name() + " lamp is green，下面总共应该有6个方向能看到汽车穿过！");
}
public Lamp blackOut(){
this.lighted = false;
if(opposite != null){
Lamp.valueOf(opposite).blackOut();
}
Lamp nextLamp= null;
if(next != null){
nextLamp = Lamp.valueOf(next);
System.out.println("绿灯从" + name() + "-------->切换为" + next);
nextLamp.light();
}
return nextLamp;
}
}
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控制器
public class LampController {
private Lamp currentLamp;
public LampController(){
//刚开始让由南向北的灯变绿;
currentLamp = Lamp.S2N;
currentLamp.light();
ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
timer.scheduleAtFixedRate(
new Runnable(){
public void run(){
System.out.println("来啊");
currentLamp = currentLamp.blackOut();
}
},
10,
10,
TimeUnit.SECONDS);
}
}
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主函数
public class MainClass {
public static void main(String[] args) {
String [] directions = new String[]{
"S2N","S2W","E2W","E2S","N2S","N2E","W2E","W2N","S2E","E2N","N2W","W2S"
};
for(int i=0;i
new Road(directions[i]);
}
new LampController();
}
}
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Road控制器
public class Road {
private List vechicles = new ArrayList();
private String name =null;
public Road(String name){
this.name = name;
//模拟车辆不断随机上路的过程
ExecutorService pool = Executors.newSingleThreadExecutor();
pool.execute(new Runnable(){
public void run(){
for(int i=1;i<1000;i++){
try {
Thread.sleep((new Random().nextInt(10) + 1) * 1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
vechicles.add(Road.this.name + "_" + i);//访问外部类不用finally
}
}
});
//每隔一秒检查对应的灯是否为绿，是则放行一辆车
ScheduledExecutorService timer = Executors.newScheduledThreadPool(1);
timer.scheduleAtFixedRate(
new Runnable(){
public void run(){
if(vechicles.size()>0){
boolean lighted = Lamp.valueOf(Road.this.name).isLighted();
if(lighted){
System.out.println(vechicles.remove(0) + " is traversing !");
}
}
}
},
1,
1,
TimeUnit.SECONDS);
}
}