What data types for representing integers exist in Java?

In Java, the following primitive data types are used to represent integers:

• byte — 8-bit signed integer, range from -128 to 127.
• short — 16-bit signed integer, range from -32,768 to 32,767.
• int — 32-bit signed integer, range from -2^31 to 2^31-1.
• long — 64-bit signed integer, range from -2^63 to 2^63-1.

All these types are signed. The choice of type depends on the required range of values and memory efficiency.