CSC207.01 2013F, Class 53: Using Java from the Command Line

Overview

Preliminaries

Candy Canes and Clementines!
Study break 8-10 tonight, Smoothies! (May run out early.)
Who has an OCS recommendation that I need to fill out?
- EW, DG, JGS, ...
I hope to distribute most of the exam tomorrow. (I'll probably leave the code until HW11 is turned in.)
Upcoming extra credit opportunities:
- CS Extra: Multiple Models of Mediascripting
- CS Table Friday: TBD

Sam's short comments

You are effectively building a tree.
If you're building a tree-like structure, do you want to use iteration or recursion?
Basic operation: Look at the next character
- Open brace: It's an object, parse the object
- Open square bracket: It's a list
- Double quotation mark: It's a string (don't have to worry about \u, but do have to worry about \" and \)
- Digit: It's a number
- Etc.

Should we split at quotation marks or simply step through the characters?

You should step through the characters. Quotation marks can have too many meanings.

When is a digit going to happen?

{"id":23}

Goal: Escape from Eclipse
Why?
- May be more efficient with other editors.
- Want less startup time.
- Want to know what's going on "behind the scenes"
javac - Compile a .java file
java - Run a compiled .java file
CLASSPATH - Environment variable that tells where to look for other compiled Java files.
- In most Unix/Linux variants, there are user-specific variables that let you configure the system (e.g., where to look for programs, where to look for Java stuff, what editor to use by default, ...)
- In bash, we set them with $ export VARIABLE=value; view with $ printenv VARIABLE
jar - Join lots of compiled Java files into a single "package"
javadoc - Generate documentation
junit - Run unit tests

A typical project has lots of things to do - compile, join into an application, test, run a program, clean up temporary files, etc.
In C, we write Makefiles.
The folks at Apache built Ant as a Java-oriented alternative to Make.