Java Values, types, and operators

Value

A piece of info used by a program. Every Java value has a type

Type

defines what kind of data a value represents and what operations can be performed on it

Primitive Type

A basic Java type defined by a keyword, such as int, double, char or boolean

Non-primitive type

A type that is not a primitive type, such as String or an array

int

a whole number storing using 32 bits

double

a number that can include a decimal place and is stored using 64 bits

char

one character written with a single quotation marks, such as 'a'

boolean

a value that is either true or false

String

a sequence of characters or text written with double quotation marks, such as "hello"

integer division

Division between two integers that removes the decimal. for example 5 / 2 is 2

Modulus %

returns the remainder from division

String Concatenation

Joining Strings or values together using +

Operator precedence

The order in which Java performs operations

parentheses

Can be used to change the order in which operations are performed

+

Addition or String concatenation

%

remainder after division

=

Assigns a value to a variable

+=

adds a value and stores the new result in the variable

-=

subtracts a value and stores the new result

*=

Multiplies and stores the new result

/=

divides and stores the new result

%=

Finds the remainder and stores the new result

++

Increase a variable by 1

--

Decreases a variable by 1

==

Checks whether two values are equal

!=

Checks whether two values are not equal

>=

Checks whether the left value is greater than or equal to the right value

&&

AND: true only when both conditions are true

| |

OR: true when at least one condition is true

!

NOT: changes true to false or false to true