1. Java Programming with BlueJ Objectives
After this presentation you should be able to :
Open a BlueJ project (or start a new project)
Create a new class
Edit default code
Create Java source code for each of the structures:
Sequence
Selection
Repetition

2. Java Programming with BlueJ Opening a new project
Click Project
New Project
Select YOUR C: drive

3. Java Programming with BlueJ Creating a folder for projects
Click New Folder
Name Folder: BlueJ Projects
Name Project: Structures

4. Java Programming with BlueJ
Your window should look like this

5. Java Programming with BlueJ Creating a new class
Click New Class
Name Class: Student
Select Class Button
Click OK

6. Java Programming with BlueJ
Your window should look like this
The diagonal bars indicate a class that has errors or has not been compiled.

7. Java Programming with BlueJ Editing the code
Right click the class
Select Open Editor
You will see these features provided for you.
Private attribute
Default constructor
A method

8. Converting pseudo code to Java Sequence Statements
Construct a segment of code that will display the text “Hello World” and “I am a student at AACC”.
Pseudo Code Java Code
print “Hello World” System.out.println(“Hello World”);
print “I am a student at AACC” System.out.println(“I am a student at AACC”);

9. Java Programming with BlueJ Adding your own code – Sequence Structure
Convert the sampleMethod to MyMethod shown here
To output of this code

10. Java Programming with BlueJ Compiling the code
Click Compile from either window.
The diagonal lines in the Student class should disappear.
‘no syntax errors’ should appear in the box below.

11. Java Programming with BlueJ Instantiating the class
Right click the Student Class.
Select new Student( )
Accept the default name.
Click OK
An instance of the Student class appears on the object bench

12. Java Programming with BlueJ Running the code
inherited from Object
void MyMethod( )
Inspect
Remove
Right Click the student1 object
Select MyMethod()

13. Java Programming with BlueJ
Your output window should look like this
The output from the System.out.println statements appear in a Terminal Window for the Structures project.
Review the code that got us here.

14. Java Programming with BlueJ Editing the constructor and adding an instance variable.
Add the attribute grade (an integer).
Edit the constructor to include the parameter newGrade and the assignment statement.
To the execution of the constructor

15. Converting pseudo code to Java Selection Statements
Write a segment of code that will convert a letter grade to an A or B.
Pseudo Code Java Source Code
if grade >= 90 then if (grade>= 90)
print “A” System.out.println(“A”);
else else
print “B” System.out.println(“B”);
end if

16. Java Programming with BlueJ Adding another method – selection structure.
Add another method called method2.
method2 has no parameters and no local variables.
method2 contains a multi-way selection structure.
Compile the code.
Show output from this structure.

17. Java Programming with BlueJ Running the new code.
Right click the Student class.
Select new Student()
A new window appears because the constructor now expects a parameter.
Input an integer value, click OK.
Review the code that got us here.

18. Java Programming with BlueJ Running the new code.
Right click the object.
Select method2( )
inherited from Object
void MyMethod( )
void method2( )
Inspect
Remove

19. Java Programming with BlueJ
Your output window should look like this
The output from the System.out.println statement appears in a Terminal Window for the Structures project.
Review the code that got us here.

20. Converting pseudo code to Java Repetition Statements
Construct a loop that will display the numbers 1 – 10.
Pseudo Code Java Code
for x = 1 to 10 for (x = 1; x <= 10; x++)
print x System.out.println(x);
end for

21. Java Programming with BlueJ Adding another method – repetition structure.
Add another method called method3.
method3 has no parameters and no local variables.
method3 contains a for loop (repetition structure).
Compile the code.
Show output from this structure.

22. Java Programming with BlueJ Running the new code.
Right click the object.
Select method3( )
inherited from Object
void MyMethod( )
void method2( )
void method3( )
Inspect
Remove

23. Java Programming with BlueJ
Your output window should look like this
The output from the System.out.println statements appears in a Terminal Window for the Structures project.
Review the code that got us here.

24. Java Programming with BlueJ Assignments
Work on assignments given by your instructor.