要求：
借助同步机制，sleep()方法，join()方法，实现动画显示；
甲线程：1、3、5、7、9
乙线程：2、4、6、8、10
丙线程：a、b、c、d、e
main()线程输出：线程开始，线程结束
输出结果：线程开始，1-a-2## 3-b-4## 5-c-6## …
思考：
使用多个判断标记，模拟（消费者-生产者）每线程输出一个后就等待，然后改变自己的标记
临界资源–使用多个== putX() == 方法，判断属于自己的标记(== isEmptyX ==)然后输出
使多个线程有序的交替执行
代码：
class Resource{
private boolean isEmpty01 = true;
private boolean isEmpty02 = false;
private boolean isEmpty03 = false;
//每个put方法对应一个输出，每输出一个就等待，等待其他人的唤醒
public void put1(){
while(!isEmpty01){
try{
wait();
}catch(InterruptedException e){
e.printStackTrace();
}
}
//输出后
isEmpty01 = false;
isEmpty02 = true;
notifyAll();
}
public void put2(){
while(!isEmpty02){
try{
wait();
}catch(InterruptedException e){
e.printStackTrace();
}
}
isEmpty02 = false;
isEmpty03 = true;
notifyAll();
}
public void put3(){
while(!isEmpty03){
try{
wait();
}catch(InterruptedException e){
e.printStackTrace();
}
}
isEmpty03 = false;
isEmpty01 = true;
notifyAll();
}
}
class Player01 implements Runnable{
private Resource res;
private String[] arr;
Player01(){}
Player01(String[] arr,Resource res){
this.arr = arr;
this.res = res;
}
public void run(){
synchronized(res){
for(int i=0;i<arr.length;i++){
//错误的点
//61,62,这两句不能交换顺序
res.put1();
System.out.print(arr[i]+"-");
try{
Thread.sleep(1000);
}catch(InterruptedException e){
e.printStackTrace();
}
}
}
}
}
class Player02 implements Runnable{
private Resource res;
private String[] arr;
Player02(){}
Player02(String[] arr,Resource res){
this.arr = arr;
this.res = res;
}
public void run(){
synchronized(res){
for(int i=0;i<arr.length;i++){
res.put2();
System.out.print(arr[i]+"-");
try{
Thread.sleep(1000);
}catch(InterruptedException e){
e.printStackTrace();
}
}
}
}
}
class Player03 implements Runnable{
private Resource res;
private String[] arr;
Player03(){}
Player03(String[] arr,Resource res){
this.arr = arr;
this.res = res;
}
public void run(){
synchronized(res){
for(int i=0;i<arr.length;i++){
res.put3();
System.out.print(arr[i]+"## ");
try{
Thread.sleep(1000);
}catch(InterruptedException e){
e.printStackTrace();
}
}
}
}
}
class Test08{
public static void main(String[] args){
String[] arr1 = {"1","3","5","7","9"};
String[] arr2 = {"a","b","c","d","e"};
String[] arr3 = {"2","4","6","8","0"};
Resource res = new Resource();
Player01 p1 = new Player01(arr1,res);
Player02 p2 = new Player02(arr2,res);
Player03 p3 = new Player03(arr3,res);
Thread t1 = new Thread(p1);
Thread t2 = new Thread(p2);
Thread t3 = new Thread(p3);
t1.start();
t2.start();
t3.start();
}
}
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执行结果：
重要的是：
这种利用标记可以实现超过2个线程的有序交替执行
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