Explanatory Question

Can every class be referred to as a user-defined datatype?

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📘 Detailed Answer

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Answer with Explanation

If the class is written by you (the programmer) → Yes, it is a user-defined datatype.
If the class is part of the Java API (like String, ArrayList, Scanner) → No, these are pre-defined datatypes (though still reference/composite types).

👉 In short:

Every class=a reference type.
If programmer creates it → user-defined.
If Java provides it → pre-defined.

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