java，

java，

public class ThreadA
{
public static void main(String[] args)
{
ThreadB b=new ThreadB();
b.start();
System.out.println("b is start....");
synchronized(b)//括号里的b是什么意思,起什么作用?
{
try
{
System.out.println("Waiting for b to complete...");
b.wait();//这一句是什么意思，究竟让谁wait?
System.out.println("Completed.Now back to main thread");
}catch (InterruptedException e){}
}
System.out.println("Total is :"+b.total);
}
}


class ThreadB extends Thread
{
int total;
public void run()
{
synchronized(this)
{
System.out.println("ThreadB is running..");
for (int i=0;i<100;i++ )
{
total +=i;
System.out.println("total is "+total);
}
notify();
}
}
}