Held: Monday, 20 September 2004
Summary:
Today we check our understanding of Java basics by writing some simple
Java programs.
Due
Assignments
Notes:
- Those of you paying attention to the course at a glance may have noticed that an exam was due this coming Friday. I've decided to delay that exam for a week.
- The goal of today's class is to resolve some of the compilation issues that many of you have had.
- For the first part of the lab, we'll put things in package userid.lab01a. These instructions should help you set up the directory structure for that package.
- Note that you should follow these instructions in a terminal window.
- Make sure your CS152 directory is generally available.
- Change to your CS152 directory.
- Within that directory, create a subdirectory with your userid (unless you already have that directory).
- Make that directory accessible to others.
- Switch to that directory.
- Create the directory
lab01a.
- Make that directory accessible to others.
- Switch to that directory.
- Start kate.
a. Create a main class called Critic in package youruserid.lab01a. The Critic class should contain only a main method. That method should prompt the user for his or her favorite color and make a comment on that color.
b. Update Critic so that it makes a different comment for the color blue than for other colors.
a. Create three model classes, Roger, Pauline, and Chris. Each should provide a method, comment(PrintWriter pen, String phrase), that provides a comment on the particular string. (E.g., "Hmmm ... phrase fascinates me.")
b. Create a main class, Panel, with a main method that builds an object in each of the three classes you've just created, prompts the user for a favorite phrase, and asks each of the objects to comment on that phrase.
Prepare a directory structure for a package named lab01.userid.
a. Write a main class, UpCounter, in package lab01.userid. The main method should prompt for an integer and print out the integers between 1 and that integer, inclusive, in increasing order. For example,
Please enter an integer: 5
1 2 3 4 5
b. Write a main class, DownCounter, in the same package. The main method should prompt for an integer and print the integers between that integer and 1, inclusive, in decreasing order. For example,
Please enter an integer: 3
3 2 1
c. Write a main class, UpDownCounter, in the same package. The main method should prompt for an integer, and count from 1 up to that integer and then back down to 1. For example,
Please enter an integer: 4
1 2 3 4 3 2 1
d. Write a main class, EvenCounter, in the same package. The main method should prompt for an integer, and print the positive odd numbers less than that integer. For example,
Please enter an integer: 12
1 3 5 7 9 11
e. Write a main class, DoubleCounter, in the same package. The main method should prompt for an integer, and count up to every number between 1 and the integer entered. For example,
Please enter an integer: 5
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
;
Check with Bobby