How can the wait() and notify() methods be called on Objects that are not threads?

Question

How can the wait() and notify() methods be called on Objects that are not Threads? That doesn\'t really make sense, does it?

Surely, it mus

Answer 1

You can use wait() and notify() to synchronize your logic. As an example

synchronized (lock) {
    lock.wait(); // Will block until lock.notify() is called on another thread.
}

// Somewhere else...
...
synchronized (lock) {
    lock.notify(); // Will wake up lock.wait()
}

with lock being the class member Object lock = new Object();