java会立即调用等待的线程吗？

Question

我正在编写一个Java代码，其中在满足特定条件后，在等待线程上调用notify，但等待线程不会立即开始运行。原因可能是什么

Answer 1

wait（以及notify）需要使用同步监视器。如果调用notify的代码没有释放它，那么wait将继续“等待”直到释放监视器

// wait thread
synchronized (syncObject) {
   syncObject.wait(); // to proceed to next line, 
                      // this thread must wait until notify is called 
                      // and then take ownership over syncObject
   // next line
}

...

// notify thread
synchronized (syncObject) {
   syncObject.wait();
   while (true) {}; // infinite loop, syncObject is never released, 
                    // wait thread will never gain ownership over syncObject 
                    // and will never wake up 
}