Java's Primitive Data Types and Reference Data Types

Primitive Types

• There are a total of 8 primitive types predefined and provided.
• As they have default values, they do not have Null.
• They are stored in the stack memory, which is the space for storing actual values.
• String is an object and not a primitive type.

Reference Types

• All types except primitive types are reference types.
• Null, which represents an empty object, exists in reference types.
• The space for storing the address value of the location where the value is stored is in the heap memory.
• There are no syntax errors, but runtime errors occur when using Null for objects or arrays, leading to a NullPointException. Therefore, variables should be assigned values.