Final answer:
The given NetBeans project uses recursion to print all substrings of a given input string.
Step-by-step explanation:
The given NetBeans project uses recursion to print all substrings of a given input string. The subject of this question is Computer Science.
The recursive method printSub1 in the given NetBeans project asks the user for a string of letters and prints all the substrings of the input string. It does this using recursion, without any loops. The method takes the input string as a parameter and recursively calls itself to print all the possible substrings.
For example, if the user enters 'abcd', the recursive method will print the substrings in the following order: abcd, abc, ab, a, bcd, bc, b, c, cd, and d.