Homework for January 24^th and 25^th

Review notes and code from Lecture 4 – January 20^th

Read page 135 in our text about the printf method and look at the java API (java documentation) about the method.

Look at Appendix M for the predefined constants associated with wrapper classes for the numeric primitive types and determine how to find out what they are (write a bit of code).

Integer - page 819

Float – page 795

Byte – page 755

Short – page 865

Long - page 847

Double – page 789

Review ProductCodes.java and understand the code well enough to be able to answer

questions about String code such as

which position in the String array code is referred to by: code.charAt(9) ?

which positions in the String array code are being referenced by: code.substring (3,7) ?

why must we say code.equals("XXX") and not code == "XXX" ?

what would be better variable names than banned and valid? Why?