What is quartz server?

Related questions

1. What is difference between wait () and sleep () method?
2. What is deadlock and when it can occur?
3. What is asynchronous call in Java?
4. What does joining a thread do?
5. Can we override main method?
6. Can we execute a program without main () method?
7. What is Quartz job scheduler?
8. Does every class need a main method?
9. Does wait release lock?
10. How do cron jobs work?

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