思路：
1.起始变量：0和10（或者9）
2.10个线程，每个线程绑定一个数字
代码实现如下：
class Main {
//锁
private static Object lock = new Object();
static int startNum = 0;
static int endNum = 10;
public static void main(String[] args) {
ThreadPrint[] arr = new ThreadPrint[endNum];
//不按打印顺序创建线程
for (int i = arr.length - 1; i >= 0; i--) {
arr[i] = new ThreadPrint(i);
arr[i].start();
}
}
private static class ThreadPrint extends Thread {
private int printNum; //获取自己需要打印的数字
ThreadPrint(int printNum) {
this.printNum = printNum;
}
@Override
public void run() {
synchronized (lock) {
while (startNum < endNum) {
if (startNum == printNum) {
System.out.print(printNum);
startNum++;
if(startNum == endNum) {
System.out.print("\n打印结束");
}
lock.notifyAll();
} else {
try {
lock.wait();
} catch (InterruptedException e) {
//线程被打断
e.printStackTrace();
}
}
}
}
}
}
}
