What is inside heap and stack?

Heap stores objects created using the new keyword, arrays, and other dynamically allocated data. It is a common memory area for all threads.

Stack stores primitive data types (int, float, boolean, etc.), references to objects in the heap, local variables, and method call information. Each thread has its own stack.

Here is a comparison table:

Characteristic	Heap	Stack
Memory allocation	Dynamic (Runtime)	Static (Compile-time)
Lifetime	Until garbage collection	Until method completion
Thread safety	Not thread-safe	Thread-safe
Size	Variable	Fixed or limited

Example of object creation:

// Creating an object on the heap
MyObject obj = new MyObject();

// Primitive types on the stack
int count = 10;
boolean isValid = true;