public class JoinThread extends Thread
{
public static int n = 0;

static synchronized void inc()
{
n++;
}
public void run()
{
for (int i = 0; i < 10; i++)
try
{
inc();
sleep(3);  // 為了使運(yùn)行結(jié)果更隨機(jī)，延遲3毫秒

}
catch (Exception e)
{
} 
}
public static void main(String[] args) throws Exception
{

Thread threads[] = new Thread[100];
for (int i = 0; i < threads.length; i++)  // 建立100個(gè)線程
threads[i] = new JoinThread();
for (int i = 0; i < threads.length; i++)   // 運(yùn)行剛才建立的100個(gè)線程
threads[i].start();
if (args.length > 0) 
for (int i = 0; i < threads.length; i++)   // 100個(gè)線程都執(zhí)行完后繼續(xù)
threads[i].join();
System.out.println("n=" + JoinThread.n);
}
}