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What does the Primitive Values, Wrapper Classes and Types revision sheet cover?

The eight primitive types, Size and range, the numbers an exam actually asks for, Bit width, drawn as one row, Primitive against reference, the split every type falls on, Wrapper classes, one for each primitive, Autoboxing and unboxing, Widening against narrowing, Widening cast, Narrowing cast, Which direction is this cast, Words the question will use, Traps that cost marks.

Is this for Class 11 ISC Computer Science?

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

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Primitive Values, Wrapper Classes and Types — Class 11 ISC Computer Science revision notes

A 4-page visual revision sheet for Primitive Values, Wrapper Classes and Types, 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.

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Primitive Values, Wrapper Classes and Types in one look

the eight raw types Java stores directly, and the classes built around each one

The eight primitive types

Java has exactly eight primitive types, and every one of them stores its value directly, not a reference to an object holding it
four are whole numbers of growing size: byte, short, int and long
two are numbers with a fractional part: float and double
char stores one single character, and boolean stores only true or false

Size and range, the numbers an exam actually asks for

Type	Size	Range or note
byte	1 byte	-128 to 127
short	2 bytes	-32768 to 32767
int	4 bytes	about -2.1 billion to 2.1 billion
long	8 bytes	far larger than int, written with an L suffix
float	4 bytes	fewer significant digits, written with an F suffix
double	8 bytes	the default for decimals, more significant digits than float
char	2 bytes	one character, unicode
boolean	not fixed by the language	true or false only

Bit width, drawn as one row

a byte's eight bits are all the storage it gets, so its range is fixed by exactly how many patterns eight bits can hold
a wider type is simply more of the same row, more bits and so more distinct patterns to represent a bigger range

Page 1 of 4. The full sheet, all 4 pages, opens free in the app.

What this Primitive Values, Wrapper Classes and Types sheet covers

The eight primitive types
Size and range, the numbers an exam actually asks for
Bit width, drawn as one row
Primitive against reference, the split every type falls on
Wrapper classes, one for each primitive
Autoboxing and unboxing
Widening against narrowing
Widening cast
Narrowing cast
Which direction is this cast
Words the question will use
Traps that cost marks
Tricks that save time

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