- Eager - thread safe but can be broken with below techniques
- reflection
- object cloning
- serialization/deserialization
- Lazy - in multithread environment can be archived with below techniques
- synchronize whole method
- Double checked locking - synchronize inside method + volatile
- Bill Pugh method - static Holder Class
- Enum method
Referances
Singleton all scenarios : link
Baeldung : link
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