Variables and Types

Although Java is object oriented, not all types are objects. It is built on top of basic variable types called primitives.
Here is a list of all primitives in Java:

• byte (number, 1 byte)
• short (number, 2 bytes)
• int (number, 4 bytes)
• long (number, 8 bytes)
• float (float number, 4 bytes)
• double (float number, 8 bytes)
• char (a character, 2 bytes)
• boolean (true or false, 1 byte)

Java is a strong typed language, which means variables need to be defined before we use them.