using java with comments please and no arrays

2. Write a Java program that prompts the user to enter a hexadecimal number that as anywhere between 1 and 5 digits, converts it to a decimal integer, and displays that (decimal) value. For example, hex 7 is also 7 in decimal and hex B is decimal 11. An example of a 5-digit hexadecimal number would be 1FA7D. As before, hex digits that are represented as English letters can be either uppercase or lowercase (so, either 'A' or 'a' would stand for decimal 10). You are encouraged to use one or more loop(s). You are not allowed to use arrays, in this or any other problem on this assignment. For an incorrect input, your program should notify the user that the input was not valid. Show the output of your code for five test input values of your choice, at least three of which are hexadecimal numbers with 3 or more digits each; one of your test inputs should be an illegal input (i.e., not a valid hexadecimal number)