#2_string_notes.txt

string: inspection, comparison, manipulation

        inspection: length, charAt, indexOf, lastIndexOf, isEmpty, isBlank
                    <...>.charAt(index): use for string, returns character
                    <...>[index]: use for array, returns character
                    <...>.indexOf(<char>): returns integer index

        comparison: contentEquals, equals, equalsIgnoreCase, contains, startsWith, endsWith, regionMatches
                    contentEquals, equals: returns boolean if string value = value of arguments passed; latter is only for strings
                    contains: returns boolean if string contains argument passed
                    regionMatches: returns boolean if sub-regions are matched

        manipulation: type 1 ~ clean-up: indent, strip, stripLeading, stripTrailing, trim, toLowerCase, toUpperCase
                                         strip: removes all leading and trailing white spaces
                                         trim: removes only one leading and one trailing white space, not all

                      type 2 ~ transformation: concat, join, repeat, replace, replaceAll, replaceFirst, substring, subSequence
                                               concat: string + text = string
                                               join: concats many elements with delimiter

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character to string: String.valueOf(<char>)

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String: defined as a variable;
        uses concat;
        when manipulated, should be assigned to a variable;
        creates new object, returns new reference;

StringBuilder class: defined as an object;
                     uses append;
                     when manipulated, does not need to be assigned to a variable
                     (value of object changed, behaves like a queue);
                     returns self-reference;

                     delete, deleteCharAt, insert, reverse, setLength