Hi, I need help with a bonus part to a Java Programming Lab dealing with number systems and conversions. It's asking for user information to be inserted and do these commands.

Convert an 8-digit octal number into a decimal number, Convert an 8-digit octal number into a 24-bit binary number, Convert a decimal integer into an 8-digit octal number, Convert a 24-bit binary number into an 8-digit octal number

Thank you in advance!