一个关于线程的题目,自己写了下，蒙蒙的！求大神指导！ - 黑马程序员技术交流社区

public class Christmas {
public static void main(String[] args) {
new Christmas();
}
// 圣诞老人的信号量
OldMan[] ooMans = new OldMan[1];
private Semaphore oldman = new Semaphore(0);
Semaphore oldworkSemaphore = new Semaphore(1);
// 小孩的信号量
private Semaphore child = new Semaphore(3);
Semaphore chSemaphore = new Semaphore(1);
// 鹿的信号量
private Semaphore deer = new Semaphore(9);
Semaphore deSemaphore = new Semaphore(1);
// 小孩的计数器
private int countchild = 0;
// 鹿的计数器
private int countdeer = 0;
// 小孩子list
List<Child> listC = new ArrayList<Child>();
// 鹿数组
Deer[] deers = new Deer[]{new Deer(1),new Deer(1),new Deer(2),new Deer(3),new Deer(4),
new Deer(5),new Deer(6),new Deer(7),new Deer(8),new Deer(9)};
public Christmas() {
for (int i = 0; i < ooMans.length; i++) {
ooMans[i] = new OldMan(i);
ooMans[i].start();
}
Timer timer = new Timer();
timer.schedule(new Mtimer(), 0, 5000);
for (int i = 1; i<1000; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
Child c = new Child(i);
// listC.add(c);
c.start();
}
}
class Mtimer extends TimerTask{
public void run() {
for (int i = 1; i < deers.length; i++) {
try {
Thread.sleep(200);
} catch (InterruptedException e) {
}
deers[i] = new Deer(i);
deers[i].start();
}
}}
// 圣诞老人
class OldMan extends Thread {
Child childcChild = null;
Deer deerdDeer = null;
int oldmanId = 0 ;
public volatile String state = "空闲";
public OldMan(int i) {
this.oldmanId = i;
}
public void run() {
while (true) {
try {
//圣诞老人在睡觉等待被唤醒
oldman.acquire();
checkstate();
oldworkSemaphore.acquire();
System.out.println("圣诞老人被叫醒了，看看是谁叫醒了他！");
oldWork();
oldworkSemaphore.release();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
//圣诞老人的工作方法
public void oldWork() {
//先判读鹿在判读孩子鹿比孩子重要
if (countdeer == 9) {
System.out.println("9头驯鹿叫醒了圣诞老人！");
System.out.println("鹿都回来了，绑雪橇！");
countdeer = 0 ;
deer.release(9);
System.out.println("绑好雪橇去休息了！");
state = "空闲";
deerdDeer.state = "出去";
} else if (countchild == 3){
System.out.println("3个孩子叫醒了圣诞老人！");
System.out.println("有3个孩子有困难，帮孩子解决问题");
countchild = 0 ;
child.release(3);
System.out.println("解决完孩子们的困难去休息了！");
state = "空闲";
childcChild.state = "有困难，找圣诞老人！";
}
}
//判断圣诞老人的状态
private void checkstate(){
while(!"繁忙".equals(state)){
//如果是满的状态就卧倒，让出执行权 ,线程并没有销毁，先进栈的会先出栈
yield();
}
}
public void setchild(Child child) {
this.childcChild = child;
}
public void setdeer(Deer deer) {
this.deerdDeer = deer;
}
}
// 孩子
class Child extends Thread {
OldMan ooMan;
int childID ;
public volatile String state = "玩玩具";
// public volatile String state = "有困难，找圣诞老人！";
public Child(int id) {
this.childID = id;
}
public void run() {
try {
//检查孩子自身的初始状态
checkstate2();
//来了一个孩子孩子的信号量就减一
child.acquire();
//同时孩子的计数器就加一
countchild++;
System.out.println(childID+"号孩子有困难！");
//如果有3个孩子就叫醒圣诞老人
chSemaphore.acquire();
if (countchild == 3){
checkstate();
oldman.release();
}
chSemaphore.release();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//判断圣诞老人处于什么状态空闲了就取得圣诞老人
private void checkstate() {
OldMan oldMan = null;
//凑齐3个孩子去取得圣诞老人
AA: while (true) {
for (int i = 0; i < ooMans.length; i++) {
if (ooMans[i].state == "空闲") {
oldMan = ooMans[i] ;
break AA;
}
}
}
oldMan.setchild(this);
this.setold(oldMan);
oldMan.state = "繁忙";
}
private void setold(OldMan oldMan) {
this.ooMan = oldMan;
}
//孩子的初始状态
private void checkstate2(){
try {
System.out.println(childID+"号玩玩具！");
sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
state = "有困难，找圣诞老人！";
while(!"有困难，找圣诞老人！".equals(state)){
//如果是满的状态就卧倒，让出执行权 ,线程并没有销毁，先进栈的会先出栈
yield();
}
}
}
// 驯鹿
class Deer extends Thread {
OldMan oooMan;
public int deerid;
public volatile String state = "出去";
public Deer(int id) {
this.deerid = id;
}
public void run() {
// while (true) {
try {
//回来一只鹿鹿的信号量就减一
deer.acquire();
//鹿的计数器就加一
deSemaphore.acquire();
countdeer++;
System.out.println(deerid+"号鹿"+"回来了");
//如果9只鹿都回来了就叫醒圣诞老人
if (countdeer == 9 ){
state = "都回来了";
checkstate();
oldman.release();
}
// else {
// yield();
// }
deSemaphore.release();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// }
}
//判断圣诞老人处于什么状态空闲了就取得圣诞老人
private void checkstate() {
OldMan oldMan = null;
// //判断所有的鹿都回来了没有
// if("出去".equals(state)){
// //如果是满的状态就卧倒，让出执行权 ,线程并没有销毁，先进栈的会先出栈
// yield();
// }
//凑齐9只鹿判断圣诞老人是不是空闲的状态
AA: while (true) {
for (int i = 0; i < ooMans.length; i++) {
if (ooMans[i].state == "空闲") {
oldMan = ooMans[i] ;
break AA;
}
}
}
oldMan.setdeer(this);
this.setold(oldMan);
oldMan.state = "繁忙";
}
private void setold(OldMan oldMan) {
this.oooMan = oldMan;
}
}
}

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