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Software Java Cheat Sheet by

Data Types

byte
8 bits
short
16 bits
int
32 bits
long
64 bits
boolean
1 bit
char
16 bit unicode
float
32 bit decimal
double
64 bit decimal

Byte (8 bits/1 byte)

-128 to 127
-27 to 27 -1
Default value is : 0
Byte data type is used to save space in large arrays, mainly in place of integers, since a byte is four times smaller than an int

Short (16 bits/2 bytes)

-32,768 to 32,767
-215 to 215 -1
Short data type can also be used to save memory as byte data type. A short is 2 times smaller than an int

int (32 bits/4 bytes)

-231 to 231-1
default data type

Long (64 bits/8 bytes)

Default value is : 0L
long Variab­le_Name = Value_L;
 

Boolean (1 bits)

true and false
Default value is : false

Char (16 bits)

Unicode character
char a = 'A';
char japanese = "­\u....."

Double and Float

Decimal number
Double
64 bits/ 8 bytes
Float
32 bits / 4 bytes
mydouble = 0.1d
doublesci = 1.23e2 (scien­tific notation)
myfloat = 0.1f
 

Assign­ation Operator

Sign that use to determine data by using equal sign (=)
Ex. int x = 20;
x = 2 + 3 + 4;

Arithmetic Operator

a=30
b=15
+
Addition
a+b = 45
-
Subtra­ction
a-b = 15
*
Multip­lic­ation
a * b = 450
/
Division
a / b = 2
%
Modulus
a % b = 0
++
Increment
Increases the value of operand by 1 Ex. b++ = 16
--
Decrement
Decreases the value of operand by 1 Ex. b-- = 14

Relational Operator

==
equal to
!=
not equal to
>
grater than
<
less than
>=
grater than or equal to
<=
less than or equal to
 

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