Which of the following statements is correct? Please select all that apply. Group of answer choicesA reference variable references to an object.A data field in a class must be of a primitive type.A reference variable is an object.A data field in a class should be an instance type.
Question
Which of the following statements is correct? Please select all that apply. Group of answer choicesA reference variable references to an object.A data field in a class must be of a primitive type.A reference variable is an object.A data field in a class should be an instance type.
Solution
The correct statements are:
- A reference variable references to an object.
- A data field in a class should be an instance type.
Explanation:
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A reference variable in Java is used to refer to (or access) an object. It is not an object itself, but it is a way to access the actual object in memory.
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A data field in a class can be of any type, including primitive types (like int, char, etc.) and reference types (like String, array, etc.). It doesn't have to be a primitive type. So, this statement is incorrect.
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As mentioned above, a reference variable is not an object. It is a way to access an object. So, this statement is incorrect.
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A data field in a class can be an instance type. Instance variables (also known as non-static fields) are declared without the static keyword. They are unique for each instance (or object) of a class. So, this statement is correct.
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