Are these Arrays and Strings notes free?

Yes. The full 3-page Arrays and Strings sheet is free inside CapCompass, which runs in your browser with no account needed.

What does the Arrays and Strings revision sheet cover?

Declaring and filling a 1D array, Arrays have exactly one built-in property: length, array.length against String.length(), Array, String, Strings are objects, and they never change, The String methods that come up again and again, equals() against ==, on Strings, equals(), ==, 2D arrays and StringBuilder, briefly, Tracing a sum and a running largest.

Is this for Class 11 ISC Computer Science?

Yes, it is written for the ISC Computer Science syllabus.

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Arrays and Strings — Class 11 ISC Computer Science revision notes

A 3-page visual revision sheet for Arrays and Strings, written for Class 11 ISC Computer Science. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

Arrays and Strings revision notes, page 1 of 3 — A preview of page 1 — all 3 pages open full size in the app.

Arrays and Strings in one look

a row of fixed slots, and the one object that never lets you edit its own characters

Declaring and filling a 1D array

int[] marks = new int[5]; creates an array of 5 int slots, each holding the default value 0 until it is set
an array literal, written as int[] marks = followed by 9, 3, 7, 1, 5 inside curly braces, declares and fills the array in one line, sizing it from how many values are listed
every slot is reached by an index, and Java indexes start at 0, so the first mark is marks[0], holding 9, and the last is marks[4], holding 5
a for loop from 0 up to but not including marks.length visits every slot exactly once, whatever the array's actual size turns out to be

Arrays have exactly one built-in property: length

marks.length gives the number of slots in the array, with no parentheses, since length is a property here and not a method
marks.length never changes once the array is created, an array in Java is a fixed size from the moment it is made
the highest legal index is always marks.length minus 1, and using marks.length itself as an index fails at run time
a 2D array such as int[][] grid = new int[3][4]; is really an array of arrays, 3 rows each holding 4 int slots, reached as grid[row][col]

array.length against String.length()

Array

length is a field, written without parentheses: marks.length
fixed at creation, an array can never grow or shrink

String

length() is a method, written with parentheses: word.length()
a String object never changes either, but a new String can be built from parts of it

Page 1 of 3. The full sheet, all 3 pages, opens free in the app.

What this Arrays and Strings sheet covers

Declaring and filling a 1D array
Arrays have exactly one built-in property: length
array.length against String.length()
Array
String
Strings are objects, and they never change
The String methods that come up again and again
equals() against ==, on Strings
equals()
==
2D arrays and StringBuilder, briefly
Tracing a sum and a running largest
Traps that cost marks
Tricks that save time

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