之前想用wait()和notify的机制来做，没有成功。给一个lock信号量就可以了。
public class ThreadTest {
private static int i = 1;
private static boolean lock = false;
private static Runnable runnable1 = () -> {
while(i <= 10){
if (!lock) {
System.out.println(Thread.currentThread().getName() + "" + i++);
lock = true;
}
}
};
private static Runnable runnable2 = () -> {
while(i <= 10){
if (lock) {
System.out.println(Thread.currentThread().getName() + "" + i++);
lock = false;
}
}
};
public static void main(String[] args){
new Thread(runnable1).start();
new Thread(runnable2).start();
}
}【2个线程依次打印出1到10的数】
