How does Java manage the memory allocation of primitive and reference data types in the stack and heap?

In Java, primitive data types like int, char, and boolean are typically allocated on the stack because they have fixed sizes and are stored directly in the memory location of the variable. Reference data types, such as objects, are allocated on the heap because their sizes can vary, and they need to be dynamically managed. However, it's important to note that references to objects (not the objects themselves) can be stored on the stack. The allocation of memory depends on the context and whether the reference is local or part of an object.