Switching between multiple numeral systems is a common operation in Java programming. The conversion of numbers from octal to decimal is one such crucial conversion. Decimal numbers utilize a base of 10, which includes digits from 0 to 9, whereas octal numbers use a base of 8, which includes digits from 0 to 7. Knowing how to convert Java's octal to decimal and vice versa is crucial for working with Unix-based systems' low-level data, memory locations, and file permissions. Wesbite : https://...