Can you list the main data types used in Java?

In Java, there are two main types of data: primitive and reference.

Primitive types:

• byte — 8-bit integer
• short — 16-bit integer
• int — 32-bit integer
• long — 64-bit integer
• float — 32-bit floating-point number
• double — 64-bit floating-point number
• char — 16-bit Unicode character
• boolean — logical type (true or false)

Reference types:

• Classes (e.g., String, user-defined classes)
• Arrays
• Interfaces

Primitive types store values directly, while reference types contain a reference to an object in memory.