Stack&heap
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This document provides an introduction to the difference between stack and heap memory in programming. It defines instance variables as declared inside a class but not inside a method, while local variables are declared inside a method. The stack contains methods, local variables, and reference variables, providing static memory allocation. The heap stores global variables and uses dynamic memory allocation. An example shows local variables stored in stack memory while an object is stored in heap memory.
Stack&heap
- 1. Welcome
- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra – Mentoring Partner baabtra – Mentoring Partner is the mentoring division of baabte System Technologies Pvt. Ltd.
- 3. Stack and heap Ashwin Anand V ashwinanand99@gmail.com
- 4. Difference between instance variables and local variables • Instance variables are declared inside a class but not inside a method: class Student{ int num; // num is instance variable public void showData{} • Local variables are declared inside a method including method arguments: public void sum(int a){ int x = int a + 3; // a , x are local variables • • }
- 5. What goes inside when you declare a variable? • When you declare a variable in a application, it allocates some chunk of memory in the RAM. • This memory has three things: the name of the variable, the data type of the variable, and the value of the variable.
- 6. STACK • The Stack section of memory contains methods, local variables and reference variables. • All the information required to resume the execution of these functions is stored on the stack. • Provides static memory allocation
- 7. HEAP • The heap is simply the memory used by programs to store global variables. • All global variables are stored in heap memory. • When that function exits, the heap memory used by each local variable is freed. • Dynamic memory allocation .
- 8. Example for stack and heap public void Method() { int i=4; (stack memory) int y=2 (stack memory) Class1 cls1= new class(); (heap memory) }
- 10. Thank you