Java: Data types

Java supports two categories of data types: primitive data types and reference data types.

Primitive data types are the most basic data types in Java, and they are used to represent simple values. There are eight primitive data types in Java:

1. byte: an 8-bit integer with a range from -128 to 127.
2. short: a 16-bit integer with a range from -32,768 to 32,767.
3. int: a 32-bit integer with a range from -2,147,483,648 to 2,147,483,647.
4. long: a 64-bit integer with a range from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
5. float: a 32-bit floating-point number with a range from approximately 1.4E-45 to 3.4E+38.
6. double: a 64-bit floating-point number with a range from approximately 4.9E-324 to 1.8E+308.
7. boolean: a logical data type that can have the value true or false.
8. char: a 16-bit Unicode character with a range from ‘\u0000’ to ‘\uffff’.

Reference data types are used to represent complex objects and data structures. They include:

1. String: a sequence of characters.
2. Array: a collection of data items of the same type.
3. Class: a reference to a class.
4. Interface: a reference to an interface.
5. Enum: a reference to an enumeration type.
6. Object: a reference to an object of any class.

It’s worth noting that the size and range of the primitive data types may vary slightly depending on the implementation of the Java virtual machine. However, the semantics of the data types are standardized and do not change.