Final answer:
Autoboxing in Java refers to the automatic conversion of primitive types to their corresponding wrapper classes, like converting an int to an Integer, which is done by the Java compiler.
Step-by-step explanation:
The student asked which code shows an example of autoboxing being used correctly. Autoboxing is a feature in Java that enables automatic conversion between primitive types and their corresponding Wrapper classes. For instance, converting an int to an Integer can be done without explicit object creation.
Here is an example of autoboxing:
Integer num = 10; // This is autoboxing
In this code, the primitive int value 10 is automatically converted to an object of the wrapper class Integer. Note that this conversion is done by the Java compiler, which recognizes that an Integer object is required and accordingly creates an Integer object from the primitive int.
In this code, the integer value 10 is automatically boxed into an Integer object and assigned to the variable 'num'.
This is beneficial because it allows us to use primitive types in situations where objects are required, such as when dealing with collections or using methods that expect objects.