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4.4.4 Punctuators
Punctuators are special characters in Java used as punctuation signs. Some of the punctuators are:
• ‘?’ (question mark)
• ‘:’ (colon)
• ‘;’ (semicolon)
• ‘.’ (dot)
In Java, each and every statement ends with ‘;’ and known as statement terminator. So, it is treated as an important
punctuator.
4.4.5 Separators
Separators are the special characters used to separate the variables or characters in a Java Program. Some of the
separators are:
Name Separator Description
Comma , Used to separate multiple variables under the same declaration
Brackets ( ) Used to enclose any relational or mathematical expressions.
Curly Braces { } Used to enclose a group of statements under a single statement.
Square Braces [ ] Used to enclose the index number or cell number of a dimensional array.
4.5 DATA TYPES
A data type is an attribute of data which tells the compiler or interpreter how the programmer intends to use the
data or value. It specifies the size and type of values that can be stored in an identifier. Different data types allow
you to select the type appropriate to the needs of the application. Data types in Java are classified as shown below.
DATA TYPE
Primitive Type Non-Primitive Type
Boolean Character Integer Real/Decimal Arrays
double Char Class
float double
Interface
byte
String
short
int
long
4.5.1 Primitive Data Types
Primitive data types are predefined or built-in data types and is named by a reserved keyword. They are also called
basic data type. The eight primitive data types supported by the Java programming language are byte, short, int,
long, float, double, boolean and char. Each data type occupies a fixed size in memory.
Integer Type
Integer types can hold whole numbers such as 123, -96, etc. The size of the values that can be stored depends on
the integer type that we choose. Valid types are byte, short, int and long.
Values and Types 65

