Answers to Self Tests - Java: A Beginner's Guide - page 849

6 . How do you convert a numeric string such as "123.23" into its binary equivalent?
To convert numeric strings into their binary equivalents, use the parsing methods
defined by the type wrappers, such as Integer or Double .
7 . Write a program that copies a text file. In the process, have it convert all spaces into
hyphens. Use the byte stream file classes. Use the traditional approach to closing a
file by explicitly calling close( ) .