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 {
public static int i = 1;
public static boolean lock = false;
public static Runnable runnable1 = new Runnable() {
public void run() {
while(i <= 10){
if (!lock) {
System.out.println(Thread.currentThread().getName() + " " + i++);
lock = true;
}
}
}
};
public static Object object = new Object();
public static Runnable runnable2 = new Runnable() {
public void run() {
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();
}
}