Java data types / primitive and user defined data types

Java Data Types

• Data type represents:
• Type of data we want to use.
• Amount of memory allocation required for data.

There are two types of data types:

1. Primitive data types
2. User defined data types

1. Primitive data types: 

• There are 8 primitive data types available in Java.
• 8 keywords are defined to represent 8 primitive data types.
• Following are primitive data types: byte, short, int, long, float, double, char, boolean

2. User defined data types

• There are four types of user defined data types:
• Class type
• Interface type
• Enum type  (From Java 5)
• Annotation type (From Java 5)

Other Core Java Articles:
1. Java Characteristics / features / buzzwords
2. Java basic questions
3. Java history / java editions / java versions

4. Java keywords / Java identifiers