1. SE-1021 Software Engineering II
4/11/2019
SE-1021 Software Engineering II
Week 8, Class 1
Return Exam
Producing UML diagrams automatically in EA
Poll Everywhere
Files
Tomorrow
Week 6 HW due (if not already submitted)
Thursday
Quiz at start of lab
Dr. Yoder

2. Slide style: Dr. Hornick
SE1021
4/11/2019
Exam
If you believe that I made a mistake in counting points or similar, please ask me
If you believe that I took off too many points or incorrectly said that you made a mistake, send me a signed document (e.g. ) explaining why you deserve more points
If you would like a “second chance” to show you know something, let me know after class. 10pts max, I will announce if there is interest
If you believe that I made a mistake in counting points or similar, please notify
If you believe that I took off too many points or incorrectly said that you made a mistake, send me a signed document (e.g. from your MSOE account) explaining why you deserve more points
If you would like a chance to show that you actually knew something, let me know after class. 10pts max, will announce details to whole class if there is interest
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick
Dr. Yoder

3. Creating Diagrams in EA
Look for:
se ImportingCodeIntoEA.docx
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick

4. Slide style: Dr. Hornick
Exercises
How many bits are there in a byte?
How many values can you encode with a single byte?
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick

5. Slide style: Dr. Hornick
ASCII table
First digit
LF – Line feed (\n) 0xA
CR – carriage return (\r) 0xD
Second digit
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick

6. Slide style: Dr. Hornick
ASCII
How many bytes do you need to store one ASCII character?
How many bits do you need to store one ASCII character?
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick

7. Slide style: Dr. Hornick
Files
A file is a sequence of bytes stored on the computer
Each byte is made up of 8 bits
An ASCII character is one way of storing letters.
“Plain text files” often use ANSI ASCII encoding.
To encode other languages, we need to use a different encoding.
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick

8. Slide style: Dr. Hornick
Using files in Java
Both files and folders (Directories) are represented with a “Path” object as discussed earlier
We can open the file to get the byte stream
(Coding example)
Path path = Paths.get(…);
boolean isDir = Files.isDirectory(path);
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick

9. Reading the bytes from a file
InputStream is an abstract class to represent reading bytes
FileInputStream is a class that reads bytes from a file.
Use inputStream.read() to read one byte
Returns -1 (an integer) if the byte is not read
Use inputStream.read(…) to read multiple bytes at a time
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick

10. Slide style: Dr. Hornick
SE1021
4/11/2019
Your turn!
Use FileReader to read a file.
Use reader.read() to read a character from the file
Print the characters on the screen.
SE-1021
Dr. Josiah Yoder
Slide style: Dr. Hornick
Dr. Yoder