As for 'real time examples' you could discuss the concept of an 'Event', e.g. An Event class represents trade events flowing through a financial system in real time, an instance of that Event class is the object.
Firstly please UseAMeaningfulSubjectLine for your topic. This is your second thread with the same subject "Interview question". Regarding your question, an object can be a student with roll number 123 whereas student itself is a class. Please take some time to read the ask good question link below.
Hmm. I don't want to sound discouraging, but if you struggle with this question in an interview, you are probably not ready to be interviewing for a Java job.
Rather than go through that pain, have a read through the Java tutorial. This covers the basics. You might also Google for "Thinking In Java" which is a good, free book about the language.
I agree with Paul. If you ask this. Why not ask can a car for example be an "object"? Can car be a "class"?
Ultimately I personally think, anything can be object and/or class depending on how you look at it. It's like if it "has" attributes then it's a class/object. If it can't have any lower-denominated attribute (so to speak) then it can't be class/object.
Simple definition in real life is object=physical representation and class=logical representation of something.
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