Stack vs Heap in JAVA

 You’ve written Java code. But do you know how it actually runs in memory?

Java has two main memory areas: Stack and Heap. Understanding them helps you write faster, safer, and more efficient code.

Let’s break it down simply 👇

Stack Memory

• Stores method calls and local variables

• Works like a stack of plates — last in, first out (LIFO)

• Fast, but small in size

• Each thread has its own stack

example - 

public void greet() {

    String name = "Aarav";  // stored in stack

}

✅ Automatically cleaned up when the method ends
❌ Only holds simple, short-lived data

Heap Memory

• Stores objects created with new

• Shared by all parts of the program

• Bigger and slower than stack

• Needs garbage collection

Student s = new Student();  // s is in stack, object is in heap

Student s = new Student();  // s is in stack, object is in heap