Gregory M. Kapfhammer
Key Concept
Corresponding Diagram
In-Class Discussion
In-Class Activity
Details in the Textbook
Displaying pixels on the screen
Using a coordinate system
Representing color with RGB values
Try to use the showrgb command in the terminal!
Can you connect the RGB values to a specific color?
Run git pull download master in your "inclass" repository
Follow the instructions in the source code to run the program
What is the output of this program?
How does this program create graphical output?
Where do you see pixels on the screen?
Write two sentences to describe the output
Remember to transfer your source code to GitHub!
Similarities and differences?
Can you create a list for both of these?
What does this look like in memory?
Aliases for reference variables
Refer to Section 3.1 for more details and diagrams!
Real world examples of string processing?
Purpose of and ways to index a string?
See Figure 3.1 for the methods provided by String
Let's Try It!
String "mutations" change the content of strings
git pull download master
Finish the program from Listing 3.1 on page 106
Ensure that the program produces the correct output
Can you explain the output of this program?
What is a class library?
Application programming interface (API)
What are some examples of packages?
Check the online documentation!
Make sure to use an import!
Let's explore a new package!
Provided by java.util.Random
Calculations based on a seed value
Study the source code in Listing 3.2
Will the program always produce this output?
See Figure 3.4 for examples of Random methods
What do you do if the output needs a special format?
The DecimalFormat and NumberFormat classes
You can format correct for currency and percentages!
See details in the text — may help on an assignment!
What to do if a variable only has a few possible "types"?
For instance, a letter grade has distinct values
Or, across the world, seasons have categories
You can use enumerated types to define these categories
See details in the text — may help on an assignment!