=========================  QUICK DEMO: homework 6

                                   -----   v1: fill in the blanks
                                               - IVs, names, static
                                   -----   v2: canvas, tester


=========================  FIXING SOLUTION TO EXERCISE: the split

> Student s = new Student( "810061 04,SCHAFER,J,BEN,123456,schafer@cs.uni.edu" );
> s.emailDomain()
"uni.edu"
> Student t = new Student( "810061 04,GUY,MADE,UP,234567,indecipherable.mess@gmail.com" );
> t.emailDomain()
"mess@gmail.com"

                                   -----   fix: split at @ first!
    String[] emailComponents = emailAddress.split( "@" );
    String   domain          = emailComponents[1];

> Student s = new Student( "810061 04,SCHAFER,J,BEN,123456,schafer@cs.uni.edu" );
> s.emailDomain()
"uni.edu"
> Student t = new Student( "810061 04,GUY,MADE,UP,234567,indecipherable.mess@gmail.com" );
> t.emailDomain()
"gmail.com"


=========================  TASK: read lines from a CSV file into set of object

> StudentReader reader = new StudentReader(
     FileChooser.getMediaPath("ew/ClassList.csv") );
> Student[] csOne = reader.getRoster();
> csOne[0]
ID: <an id>
 <a name>
<an e-mail address>
> csOne[1]
ID: <another id>
 <another name>
<another e-mail address>


=========================  TASK: fix problems -- too [few|many] slots

> csOne.length
50
> csOne[49]
null
> csOne[29]
null
> csOne[24]
null
> csOne[23]
ID: <yet another id>
 <yet another name>
<yet another e-mail address>

                                   -----   1 add a guard, then break
                                   -----   2 trim the array

> StudentReader reader = new StudentReader( FileChooser.getMediaPath("ew/ClassList.csv") );
> Student[] csOne = reader.getRoster();
> csOne.length
24
> csOne[23]
ID: <yet another id>
 <yet another name>
<yet another e-mail address>
> csOne[24]
ArrayIndexOutOfBoundsException: 
  at java.lang.reflect.Array.get(Native Method)

                                   -----   see slide for a "template"


=========================  EXERCISE: read e-mail addresses from prospects file

mac os x > cd ~/home/teaching/cs1/sessions/session24/ew/
mac os x > ll
total 112
-rw-r--r--   1 wallingf  wallingf   1293 Nov 16 11:32 ClassList.csv
-rw-r--r--   1 wallingf  wallingf  44999 Nov 21 09:12 prospects-101806.csv
mac os x > wc
^C
mac os x > wc prospects-101806.csv 
     218    2290   44999 prospects-101806.csv

> String filename = FileChooser.getMediaPath( "ew/prospects-101806.csv" );
> ProspectReader reader = new ProspectReader( filename, 218 );

> String[] addresses = reader.getAddresses();
> addresses[137]
""
> addresses[138]
""someusername@hotmail.com""

> addresses[138].charAt(0)
'"'
> addresses[138].charAt(1)
's'

                                   -----   QUICK: how to trim inner ""?

> String filename = FileChooser.getMediaPath( "ew/prospects-101806.csv" );
> ProspectReader reader = new ProspectReader( filename, 218 );
> String[] addresses = reader.getAddresses()
> addresses[137]
""
> addresses[138]
"someusername@hotmail.com"
> addresses[138].charAt(0)
's'
> addresses[138].charAt(1)
'o'


=========================  EXERCISE: how many hotmail addresses?

> String filename = FileChooser.getMediaPath( "ew/prospects-101806.csv" );
> ProspectReader reader = new ProspectReader( filename, 218 );
> reader.numberOfAddressesAt( "gmail.com" )
4
> reader.numberOfAddressesAt( "hotmail.com" )
35
> reader.numberOfAddressesAt( "yahoo.com" )
14


=========================  TASK: read a Picture from the web!

> FoxTrotDownloader app = new FoxTrotDownloader();
> //Picture p =// app.getTodaysCartoon();
//> p.show();//