'how to alert/notify after a specific time frame completes in java

I want to send notification after a specific timeframe completes. For example, I have 3 users A,B,C. I want to notify user C when user A & B completes their 9 hours. User A start time is 8:00 AM User B start time is 8:30 AM

there should be 2 notifications sent to user C . one at 5:00 PM regarding User A and second at 5:30PM regarding User B.

I dont want to use multithreading.because in actual scenario , there will be 300-400 users whose notification will be sent after 9 hour completion to one person.

Can you suggest some java mechanism/tool/cloud service suitable for this scenario.

Thanks

javanotificationsbackendalert


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