Answer:
True. When using the "super" keyword in the implementation of a subclass constructor, it must be used in the first line of the constructor body.
Step-by-step explanation:
The "super" keyword is used to invoke the constructor of the superclass (i.e., the parent class) from within the subclass constructor. By calling "super" as the first line of the subclass constructor, it ensures that the superclass constructor is executed before any other code in the subclass constructor. This allows for proper initialization of the inherited attributes and any additional setup required by the superclass.
If "super" is not called as the first line of the subclass constructor, the compiler will automatically insert it as the first line of code in the constructor. Thus, it is a requirement to use "super" in the first line of the constructor body to ensure the proper execution of the superclass constructor.