java - Pausing a thread from another one: how to or alternatives -


i'm facing problem. have java client-server application manages restaurant; need use keyboard input , output in order manage it. waiter class has 2 threads: 1 reads orders input, , 1 continuatively listening (using multicast) ready dish needs delivered table.
considering meant done keyboard, "ordering" thread writes standard output "do wanna make order? [y/n]" , waits answer, while "delivery" thread listens delivered.
if waiter chooses order something, second thread doesn't show until order finished (done using status boolean); if waiter free (which means, showing hint: "do wanna order?") , ready dish arrives see on standard input "there delivered. wanna deliver it? [y/n]" , wait answer.
problem that, whatever chooses, don't have control on thread read answer: did mean deliver or order?
i've tried many possibilities, not working:
- closing ordering scanner input, can't close;
- pausing first thread other one, can't in java;
- synchronizing everything, not working because threads meant work together, not 1 @ time;
- use semaphores/status boolean, in case need modify "ordering" part, including infinite loop checks semaphores (i can't use acquire or release without stopping everything).
ideas/hints on how solve problem?

have 1 thread , 1 thread listening udp. can store results in thread safe collection keyboard thread read or wait on.


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