Primitive vs Wrapper Types

Java has primitive types like int, double, and boolean that hold raw values directly. It also has wrapper classes like Integer, Double, and Boolean that wrap those values inside objects.

Primitives are fast and lightweight. Wrappers are full objects that can live in collections and can be null.

Java defines exactly eight primitive types:

• byte, short, int, long for integers
• float, double for decimals
• char for a single character
• boolean for true/false

Each has a matching wrapper class in the java.lang package.