Just Java™ 2

Exercises

1. Measure the difference between buffered and non-buffered I/O operating with 10K 1-byte writes and one 10KB write, repeated 10,000 times in a loop. Draw a graph to illustrate your results. How do the results change with a buffer size of 128KB, 256KB, 512KB?

2. Modify the program that does a hex dump of a file so that it also outputs any printable bytes in a set of columns to the right of the hex dump on each line. Print the character if it has a printable form, and print a “.” if it does not. This ensures that lines are the same length and columns line up.

3. Write a Java program whose output at run-time is an exact duplicate of the program's source code. Now that we have printf, the shortest Java program to do this is well under ...