Gregory M. Kapfhammer
Key Concept
Corresponding Diagram
In-Class Discussion
In-Class Activity
Details in the Textbook
Ways to express conditions in Java programs!
Can be incorporated into if, while, and for constructs
Logical operators and truth tables
Any questions about these basic building blocks?
Read in two values from the user
Compare the two values with an if statement
If the values are the same, print this out
Otherwise, print out that they are different
Allows us to implement conditional logic
See if(hours>STANDARD) on page 218
See if(myCoin.isHeads()) on page 219
Wait! We can also have an else component!
Any questions about the use of this construct?
Floats, characters, and objects
Different methods for different data
Boolean and int are easy!
Comparing a floating point is hard! Why?
Remember, characters are just numbers!
For objects, we look at the address in memory
Run the git pull command!
View the source code of the two new programs.
You should see ifElseDemo and ifElseDemoCap
How do these programs actually work?
Can you compile and run these programs?
What output do these programs produce?
Loop that evaluates a boolean condition
Check condition, execute body, check condition
Allows a program to repeatedly perform an action!
Sometimes, the condition tests a "sentinel value"
You can modify while behavior with break and continue
Run the git pull command in the share repository
Compile and run the Average.java program
What output does this program produce?
How does this program work?
Write a summary sentence to describe this program and its output!
Compile and run the Hooray.java program
What output does this program produce?
How can you stop this program?
Compile and run the WhileLoopExample.java program
This program has a bug in it. Can you fix it?
Process a collection of items in a loop
Use method calls to "iterate" through objects
Let's try it with the URLDissector.java program!
How does this program work?
Write a summary sentence to explain this program!
Often, we need to manage sets of objects!
What data structure will help us to do this?
The ArrayList is a great choice!
We can store objects of a specified type
Let's try this with the Shuffler program
What output does this program produce?
Write a summary sentence to explain this program!