It is possible to write precedes
without any
if
statements. How? By using
a complex boolean
expression.
Write precedes
so that it has only one line, a
return
of an appropriate boolean
expression. Make sure to test your method.
Which version of precedes
do you prefer? Why?
Write and test a method, SimpleDate tomorrow()
, that returns the
day after the current date. For example, if d
is
August 29, 1987, then d.tomorrow()
should be
August 30, 1987. If d
is July 31, 1995, then
d.tomorrow()
should be August 1, 1995.
Write and test a method, isValid
, that returns true if the current
date is legal and false otherwise. A date is legal if the month is
legal and the day is at least one and no more than the number of days
in that month.
Write and test a method, void correct
,
that corrects an invalid date by advancing or backing up the
appropriate amount. For example, the 14th month of 1964 should be the
second month of 1965, the 0th month of 1931 should be the 12th month of
1930, the 32nd day of June should be the 2nd day of July, the 62nd day
of June should be the 1st day of August, and the -4th day of December
should be the 26th day of November.
Write and test a method, String toLongString
, that returns
the string corresponding to the longer version of the date. For
example, for the date 12/3/1964 (in U.S. format), it might return
December 3, 1964
.
Add a method, setPrintFormat
, to SimpleDate
.
This new method should allow the user to select which date format
(U.S. short, U.S. long, European short, etc.) to use. Update
toString
to check which format it should use.
isWinter
, revisited
Rewrite isWinter
so that it uses precedes
appropriately.
In Experiment J4.8, you found that Java's
string comparison is case-sensitive, so "white" and "WHITE" are treated
as different strings. Update the ConfigurableGreeting
applet so that it is case-insensitive.
Hint: Look at the documentation for the methods provided by
java.lang.String
.
Update ConfigurableGreeting
to support another dozen or
so colors (of your choice). These colors should be available for both
the message and the shadow.
Note: You may find it helpful to create a method that converts strings to colors.
Update ConfigurableGreeting
so that it prints up to
three messages, one per line. The applet parameters should be
named firstMessage
, secondMessage
, and
thirdMessage
. Each will appear in the same font and
color. If any of the three messages is missing, you should skip it.
Note: you'll need to take the font size into account when displaying one message per line.
Create an applet that draws shapes (squares, circles, etc.) and that permits the HTML page to customize at least three aspects of the drawing.
Create a StickFigure
applet that permits the HTML page
to customize at least three aspects of the stick figure (arm length,
shirt color, hat size, etc.).
[Front Door] [Introduction] [Code]
Copyright (c) 1998 Samuel A. Rebelsky. All rights reserved.
Source text last modified Mon Oct 25 21:31:04 1999.
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