Integer vs int: with regard to memory

by

In general, the heap memory used by a Java object in Hotspot consists of:

  • an object header, consisting of a few bytes of “housekeeping” information;
  • memory for primitive fields, according to their size (int n->32 bits)
  • memory for reference fields (4 bytes each) (Integer n ->32 bits)
  • padding: potentially a few “wasted” unused bytes after the object data, to make every object start at an address that is a convenient multiple of bytes and reduce the number of bits required to represent a pointer to an object.

as per the suggestion of Mark Peters I would like add the link below
http://www.javamex.com/tutorials/memory/object_memory_usage.shtml

More Related Contents:

  1. int[] and Integer[] arrays – What is the difference?
  2. Using int vs Integer
  3. Java: Integer equals vs. ==
  4. Integer wrapper objects share the same instances only within the value 127? [duplicate]
  5. Why doesn’t Java support unsigned ints?
  6. What does value & 0xff do in Java?
  7. The literal xyz of type int is out of range
  8. Why can not I add two bytes and get an int and I can add two final bytes get a byte?
  9. Declaring an unsigned int in Java
  10. How to convert float to int with Java
  11. “int cannot be dereferenced” in Java
  12. In java, is it more efficient to use byte or short instead of int and float instead of double?
  13. Hexadecimal to Integer in Java
  14. Converting List to List
  15. Rounding a double to turn it into an int (java)
  16. How to do an Integer.parseInt() for a decimal number?
  17. Javascript long integer
  18. How can I pass an Integer class correctly by reference?
  19. Parsing a Hexadecimal String to an Integer throws a NumberFormatException?
  20. How to cast an Object to an int
  21. How to implement infinity in Java?
  22. Return first digit of an integer
  23. Java – Change int to ascii
  24. negative char Value JAVA
  25. Arrays.asList() of an array
  26. Integer.parseInt(scanner.nextLine()) vs scanner.nextInt()
  27. Java JDK – possible lossy conversion from double to int
  28. How do I create an int array with randomly shuffled numbers in a given range [duplicate]
  29. Why does Java think that the product of all numbers from 10 to 99 is 0?
  30. Integer division in Java [duplicate]

Leave a Comment