本程序可以控制3个线程按顺序执行， 代码如下：
public class Test3 {
public static void main(String[] args) throws IOException {
final Test obj = new Test();
new Thread()
{
public void run()
{
obj.m1();
}
}.start();
new Thread()
{
public void run()
{
obj.m2();
}
}.start();
new Thread()
{
public void run()
{
obj.m3();
}
}.start();
}
}
class Test
{
static int count;
volatile int target = 1;
synchronized void m1()
{
for (int i = 0; i < 10; i++)
{
while (target == 2 || target == 3)
{
try {
wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("m1() =" + i);
target = 2;
notifyAll();
}
}
synchronized void m2()
{
for (int i = 0; i < 10; i++)
{
while (target == 1 || target == 3)
{
try {
wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("m2() =" + i);
target = 3;
notifyAll();
}
}
synchronized void m3()
{
for (int i = 0; i < 10; i++)
{
while (target == 1 || target == 2)
{
try {
wait();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("m3() =" + i);
target = 1;
notifyAll();
}
}
}