When does Java perform implicit conversion of an Integer object to the primitive type int?

In Java, an implicit conversion of an Integer object to a primitive int occurs through autounboxing. This happens when an Integer object is used in a context where an int is expected, such as assignment, arithmetic operations, or method parameters.

Example:

Integer integerObject = 10; // Autoboxing
int primitiveInt = integerObject; // Autounboxing
int sum = integerObject + 5; // integerObject is implicitly converted to int

If Integer is null, an implicit conversion to int will throw a NullPointerException.