BINARY I/O - Introduction to Java Programming: Comprehensive Version - page 704

*17.19

( View hex ) Write a program that prompts the user to enter a file name, reads bytes
from the file, and displays each byte's hex representation. ( Hint : You can first
convert the byte value into an 8-bit string, then convert the bit string into a two-
digit hex string.)

**17.20

( Binary editor ) Write a GUI application that lets the user enter a file name in the
text field and press the Enter key to display its binary representation in a text area.
The user can also modify the binary code and save it back to the file, as shown in
Figure 17.23a.

(a) (b)

F IGURE 17.23

The programs enable the user to manipulate the contents of the file in (a) binary and (b) hex.

**17.21

( Hex editor ) Write a GUI application that lets the user enter a file name in the
text field and press the Enter key to display its hex representation in a text area.
The user can also modify the hex code and save it back to the file, as shown in
Figure 17.23b.