LECTURE
OCTOBER 25 2004

ASSIGNMENTS
Wed 10/27 Assignment 3 Design
Fri 10/29 CodeLab #8

QUESTIONS
Why caps before lower case in ASCII?
- String manipulation is easier
- that's also the way things are in the dictionary
What happens if we print the delete character?
- on my home computer, I get a lowercase delta symbol
- I tried a couple of other characters (0, 1) and got nothing and a smiley face

STRINGS AND SOME OF THEIR METHODS

What?
- *string*
How?
- In Java, String class

What?
- indexing: numbering the characters in a string
How?
- zero-based

What?
- String instance method
- length method
- returns the number of characters in a string

What?
- relationship between the number of characters in a string and their indexing
- last character has the index (length - 1)

What?
- charAt method
How?
- String instance method
- first argument: int
- returns the character at that position in the string

What?
- *out-of-bound exception*
How?
- avoid using short-circuit evaluation
- example: finding the index of the first instance of a character

What?
- substring method
How?
- String instance method
- first argument: int beginning index
- second argument: int end index
- returns the String from the beginning index, inclusive, up to the end index, exclusive

What?
- toUpperCase method
How?
- String instance method
- returns a new String which is the original String in all uppercase
- does not alter the original String

COMPARING STRINGS

What?
- primitives or references
How?
- references if created using new
- primitives if created with a literal

What?
- compare using the ==
How?
- true if the variables point to the same object

What?
- *equivalence test*
- equals method
How?
- String instance method
- returns true if the characters at each position match

What?
- == versus the equals method
- equals method will always return true if == returns true
- not necessarily vice-versa

What?
- equalsIgnoreCase method
How?
- String instance method
- returns true if the characters at each position are the same, ignoring case