They were quick to interview me, and I even made it to the second round. However, no one contacted me after that. The recruiter who was in touch with me for this interview process went on leave, and I couldn't get in touch with her afterward. Weeks later, I discovered on LinkedIn that she had switched to another company. This was very unprofessional. They could have at least referred me to another recruiter or informed me of the interview results. It's been a year now, and I haven't heard back from them.

A singleton class in Java ensures that only one instance of a class exists. This is achieved through specific design patterns and coding practices.