Converting a primitive type data into its corresponding wrapper class object instance is called
Boxing
Java has primitive types (int, char, double …) that are not objects, and for each one a wrapper class in java.lang (Integer, Character, Double …) whose objects hold one primitive value.
Placing a primitive value inside an object of its wrapper class, e.g. \(\text{Integer obj = Integer.valueOf(5);}\), is called boxing. When the compiler does this automatically (Integer obj = 5;), it is called autoboxing, which is still boxing.
The reverse direction, extracting the primitive from the wrapper object (int x = obj.intValue();), is unboxing. 'Wrapping' is not the formal name of the conversion, and instantiation just means creating any object with new.
Hence, the answer is Boxing.
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