Java Programming: Data Types and Operators-Oracle Academy 4.3
short
A Java primitive data type (2 bytes) that holds integer numbers within a shorter range than an int
Declaration
A Java statement when a variable is defined but not necessarily assigned a value. Example: int x
Truncation
A concept where a number is always rounded down to the nearest integer.
char
A java primitive data type (2 bytes) that can hold single character values. Example: "a", "#", or "X"
boolean
A one-bit java primitive type that can hold the value true or false.
+
Addition Operator
literal
Can be any number, text, or other information that represents a value; used to initialize a primitive type.
==
Comparison Operator: Equal to
>
Comparison Operator: Greater Than
--
Decrement Operator--Subtracts 1
/
Division Operator-Finds the Quotient
++
Increment Operator--Adds 1
*
Multiplication Operator
Variables
Named primitive or object storage mechanisms defined in a program. The assigned value may or may not (constants) change.
x++
Post-increment Notation
++x
Pre-increment Notation
Arithmetic Operators
Symbols are used to do addition, subtraction, multiplication, division, and modular arithmetic in math expressions and formulas.
%
Division Operator-Finds the Remainder
-
Subtraction Operator
Initialization
When a variable is assigned a value for the first time
=
Assignment Operator-Sets to a value
>=
Comparison Operator: Greater Than or Equal To
<
Comparison Operator: Less Than
<=
Comparison Operator: Less than or Equal to
!
Comparison Operator: Not
!=
Comparison Operator: Not Equal To
Assignment Operator
The equals sign "=" used in a Java statement to assign a value to a variable.
Conventions
The formatting and naming standards that most programmers follow
Primitive Data Types
The group of Java data types that do not use the keyword new when declared or initialized. Primitive Data Types store the value in the same place in memory as the variable name.
Type Casting
The process of explicitly modifying one data type to become a different data type.
Type Conversion
The process of modifying one data type to become a different data type, this may be implicit or explicit.
byte
The smallest java primitive type (1 byte) that can hold an integer value.
float
This Java primitive data type (4 bytes) can be initialized with a decimal number preceding letter f. Example: float x = 3.5f;
int
This Java primitive data type (4 bytes) can hold integer values.
double
This Java primitive data type (8 bytes) is the largest primitive that can hold a decimal value.
long
This data type (8 bytes) is the largest integer type.
Scope
Used to describe the block of code where a variable exists in a program. A block of code is denoted by {}.
