files-reading-and-writing

week 13

We will learn about reading and writing files. This covers chapters 10 and 11 from the book.

Agenda, Before new content.

• Homework review - classes (maybe go over step 5 ?)
• Homework review - forms
• Homework review - try/catch
• Homework review - week 8
• Homework 8: how do you compare dates? What is a unix timestamp? How do you get them?
• look @ week 4 "notes-on-code.md"
• Don't capitalize Methods, that is not idiomatic java
• Don't capitalize package names. This is reverse DNS format.
• in the forms homework: note about catching exceptions and swallowing exceptions.
• in the classes homework, I did not see a lot of null checks. You will get NullPointer Exceptions
• go around class and see what liking and what is a struggle
• youtube videos are now up

Agenda, new content

• Reading a file in,
• writing a file out
• reading + writing at the same time.
• What is grep?
• What are we building for the homework assignment?

Datasets

I have pulled a few datasets from data.gov:

https://catalog.data.gov/dataset

We will use these to play around with reading files and pulling data out. This is a good place to go if you want to get large CSV data dumps full of interesting (actually, mostly not so interesting) statistics and raw data.

Reading files.

Writing files.

options to write files:

• CREATE
• CREATE_NEW
• DELETE_ON_CLOSE
• APPEND
• TRUNCATE_EXISTING
• WRITE