Size (in bytes) of an object? How to find?

Hello, in C++ there is a "sizeof()" function that determines the number of bytes a particular data type has.
My question is this: is there a similar function in java to determine the number of bytes of an "object" that i created?
ie........ sizeof(MyCarObject)

The size of an object in memory? Sorry, there's no way you can do that... You can try serializing the object to a file and using the size of that file as a measure but that isn't accurate.
Why would you want to do it anyway?

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Urgent: How to find out the size in bytes of java object

Hi Experts,
We've a requirement that we need to find out the size of a java object at run time, is there a direct java API to get the size of a composite object in memory?
Here is my requirement: We are adding string objects (which is an xml string of considerable size) into a List. After reaching certain size limit (lets say 5MB) of the list i need to put this data into DB as a CLOB. So every time I add a string object to the list, I need to see if the total size of the list exceeds the limit and if yes, flush the results into DB.
I am not sure if java has a direct API for this, if not what is the beast way to do it, it s critical requirement for us.
It would be really great if someone could help us out.
Thank you,
-Shibu.

>
We've a requirement that we need to find out the size of a java object at run time, is there a direct java API to get the size of a composite object in memory?
Here is my requirement: We are adding string objects (which is an xml string of considerable size) into a List. After reaching certain size limit (lets say 5MB) of the list i need to put this data into DB as a CLOB. So every time I add a string object to the list, I need to see if the total size of the list exceeds the limit and if yes, flush the results into DB.
I am not sure if java has a direct API for this, if not what is the beast way to do it, it s critical requirement for us.
It would be really great if someone could help us out.
>
Could you explain your actual requirement a little more fully.
1. Is each individual string a separate XML string? Or is it just a fragment? Why would you just concatenate them together into a CLOB? That won't produce valid XML and it won't let you easily separate the pieces again later. So provide a simple example showing some strings and how you need to manipulate them.
2. Are you using these xml strings in Java at all? Or are you just loading them into the database?
For example if you are just loading them into the database you don't need to create a list. Just create a CLOB in Java and append each string to the CLOB. Before you append each one you can check to see if the new string will put you over your length limit. If it will then you write the CLOB to the database, empty the CLOB and start appending again to the new clob instance.
If you explain what you are really trying to do we might be able to suggest some better ways to do it.

How to find out the object is available or not in BC

Hi dear friends,
Suppose I want to design/create a Cube / ODS, before going to create that object, how to find out the same type of Object is available or not in BC with the specification which I want
Thanks in advance

Hi Paul,
at least you need to know the application you are talking about. Then you can goto that particular area and evaluate the content (cubes, infoobjects, infosources, datasources). It will surely give you an idea of the fulfilment of your requirements by the content.
Siggi

How to find unused objects in SAP BI system?

Hello All,
I have got a requirement- you can say optimization programme in BW system.
For that i have to first find the list of unused obects-DSO's, IC, etc.
We have RSDODSO, RSDCUBE tables, but not sure how to use them- by looking at latest data loads/ time stamp.
If you have any suggestions on this .Please revert me back.
Regards,
Siva

HI Kumar,
For cubes: Goto se11 and use table RSMDATASTATE and check the value of the field LAST_CHANGE this is the date on which last time data is loaded in cube.
Check RSMO & find which all data loads are happening daily...weekly...montly
Refer to the link below for more info on unused objects:
How to find UNUSED InfoObjects list in BEx Query by comparing with Infoprovider.
How To Find Unused InfoObjects Part - 1.
Regards,
Ashvin

How to get the file size (in bytes) for all files in a directory?

How to get the file size (in bytes) for all files in a directory?
The following code does not work. isFile() does NOT recognize files as files but only as directories. Why?
Furthermore the size is not retrieved correctly.
How do I have to code it otherwise? Is there a way of not converting f-to-string-to-File again but iterate over all file objects instead?
Thank you
Peter
java.io.File f = new java.io.File("D:/todo/");
files = f.list();
for (int i = 0; i < files.length; i++) {
System.out.println("fn=" + files);
if (new File(files[i]).isFile())
     System.out.println("file[" + i + "]=" + files[i] + " size=" + (new File(files[i])).length() ); }

pstein wrote:
...The following code does not work. Work?! It does not even compile! Please consider posting code in the form of an SSCCE in future.
Here is an SSCCE.
import java.io.File;
class ListFiles {
    public static void main(String[] args) {
        java.io.File f = new java.io.File("/media/disk");
        // provides only the file names, not the path/name!
        //String[] files = f.list();
        File[] files = f.listFiles();
        for (int i = 0; i < files.length; i++) {
            System.out.println("fn=" + files);
if (files[i].isFile()) {
System.out.println(
"file[" +
i +
"]=" +
files[i] +
" size=" +
(files[i]).length() );
}Edit 1:
Also, in future, when posting code, code snippets, HTML/XML or input/output, please use the code tags to retain the indentation and formatting.   To do that, select the code and click the CODE button seen on the Plain Text tab of the message posting form. It took me longer to clean up that code and turn it into an SSCCE, than it took to +solve the problem.+
Edited by: AndrewThompson64 on Jul 21, 2009 8:47 AM

How can I convert an array off byte into an Object ?

Hi folks...
I�m developing an application that comunicates a PDA and a computer via Wi-Fi. I�m using a DataStream ( Input and Output ) to receive / send information from / to the computer. Most off the data received from him is in the byte[] type...
How can I convert an array off byte ( byte[] ) into an Object using MIDP 2.0 / CLDC 1.1 ?
I found on the web 2 functions that made this... but it uses a ObjectOutputStream and ObjectInputStream classes that is not provided by the J2ME plataform...
How can I do this ?
Waiting answers
Rodrigo Kerkhoff

There are no ObjectOutputStream and ObjectInputStream classes in CLDC. You must know what you are writing to and reading from the DataStream. You should write the primitives like int, String to the DataOutputstream at one end and read those in exactly the same sequence at the outher end using readInt(), readUTF() methods.

How to get folder size in bytes

Hi all,
Is there a easy way to get folder size in bytes? I don't want to check each file in it and then add them up.
Thanks for any help.
Anne

Years ago, I found my home PC was lacking disk space and could not exaplain where all of the space went.
At the same time I was teaching myslef how to use the Picture control and Windows did not allow you to check the size of a folder and it sub-folders. So I used that situation to learn about the picture control and LV at the same time.
It worked and ran but very slowly.
Soon after Greg McKaskle was putting together the first version of "The Good The Bad and The Ugly" and was looking for fodder to beat up. I offered and he accepted. When the time came for the presentation, my code was chosen as "The bad" since I had not learned how to do a cluster sort at that time so I wrote my own version of a bubble sort (the VI presents a Pie Chart of disk usage and clcik on the sectors of the Pie Chart allowed you to drill down so I hd to sort by sizes).
So why am I telling you this long boring story?
That code is attached for you to look at laugh and tell me how dumb I was.
Feel free to beat me up. It can't be any worse than the abuse I got from Greg (I felt like I was being raped).
Have fun!
Ben
Code is probably 6 or thereabouts. "Disk_Utility" is top level. Remember this is an example of how NOT to code.
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
Attachments:
DIsk_Pie_Utility.zip ‏162 KB

How to find the size of the pipe. I mean the total number of bytes/messages available in the named pipe?

How to find the size of the pipe. I mean the total number of bytes/messages available in the named pipe?
NAVEEN

I'm afraid this forum for Microsoft Project Customization and Programming is not the correct forum for your question. Please Choose correct forum in order
to get help from experts. I think your question is more relevant to SQL server
kirtesh

How to get image size in bytes

i have to get image size in bytes and accessing image from the a folder
Thanks in advance

If it's going to be accessed as a file on the filesystem, you can use java.io.File.length() to get the size in bytes.
In other situations...it depends on what you're doing.

List size in bytes

Is it possible via the object model or web servecies to get the size of a list in bytes much like storman does? The only issue with storman is that it will only display 100 lists and I have a site collection with thousands. Any help would be
greatly appreciated.
Thanks,
Dan
Dan Marth

Hello Dan,
No direct class available in SP to get the size so you need to measure the each item size and then calculate them in byte. Refer this link:
http://rajeshagadi.blogspot.nl/2011/04/how-to-find-sharepoint-list-and.html
Hope it could help
Hemendra:Yesterday is just a memory,Tomorrow we may never see
Please remember to mark the replies as answers if they help and unmark them if they provide no help

Calculate the size(in bytes) that will be displayed to the console by command Write-Output

Is there some way to check the size(in bytes) of the output that will be displayed to the console using Write-Output command. I want the console to display only the first 1024 bytes of the objects output.

Hi Sachin,
in that case let me add an example on how to read content from a file that may be or may not be a text file:
$string = [System.Text.Encoding]::UTF8.GetString([System.IO.File]::ReadAllBytes("D:\example.txt"))
Theoretically, the "Get-Content" cmdlet ought to do the same, however I have occasionally experienced different results.
You can choose to not convert it to string and just print the bytes too (or choose another encoding of your preference). Remember, a single letter usually uses 2 bytes, thus reading the first 1024 bytes from a file you converted to text would mean printing
the first 512 letters.
Cheers,
Fred
There's no place like 127.0.0.1

Programatically, Can I determine the size in bytes of each page of a pdf using C++ and Acrobat X?

Hi,
I need to create an MFC application to open a pdf and get the size of each page in Bytes.
Is it possible???
I am really appreciate to your help. Thanks

Hi,
An example of what I want to do is to open a pdf whose size is 20 MB and split it into several pdfs with a maximum size of 10 MB.
The idea is to open the pdf of 20 MB and go getting the size of the pages to see how many I can include in each new pdf..
Thanks

How to find the db size

Hi ,
Please tell me how to find the db size.
Thanks,
Kumar.

If I understand correctly, the above query will give the space allocated to the database. This isn't necessarily the same as the space used by the database. Or do I need to clean my glasses ?
I use the following to get sizes for tablespaces (may need some formatting done - works in 9i and 10g) :
SELECT
     Total.name "TABLESPACE_NAME",
     total_space "TABLESPACE_SIZE",
     nvl(Free_space, 0) Free_space,
     nvl(total_space-Free_space, 0) Used_space
FROM
     select
          tablespace_name,
          sum(bytes/1024/1024) Free_Space
     from
          sys.dba_free_space
     group by
          tablespace_name
     ) Free,
     select
          b.name,
          sum(bytes/1024/1024) TOTAL_SPACE
     from
          sys.v_$datafile a,
          sys.v_$tablespace B
     where
          a.ts# = b.ts#
     group by
          b.name
     ) Total
WHERE
     Free.Tablespace_name(+) = Total.name
ORDER BY
     Total.name
;

How to find the size of an arrayList through Expression Builder.

Hai OTN,
How to find the size of an arrayList through Expression. I have a managed bean in View Scope.I am using Jdeveloper 11.1.1.2 with ADF Faces components.
Managed Bean :
ArrayList<IllnessEmployeesObj> employeeGridList =
new ArrayList<IllnessEmployeesObj>();
JSPX :
Value="#{viewScope.PandIVH.employeeGridList.size}"
Error : java.lang.NumberFormatException: For input string: "size"

Hi Dinil,
I have provided you with a sample that would show you the how you can get the size of an arraylist
the sample has a page untitled1 and a bean named test.
I have run in on jdev 11.1.2 and it is ok, it will be ok on 11.1.3
after running the sample you will see the 2.
please remember that you must add the JSTL taglib on the viewcontroller.
just right click on viewcontroller, go to tag lib select the jstl.
page
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%@ page contentType="text/html;charset=UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn"%>
<f:view>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>untitled1</title>
</head>
<body>
<h:form>
<h:outputText value="#{fn:length(test.a)}"/>
</h:form>
</body>
</html>
</f:view>
bean
import java.util.ArrayList;
public class Test {
public Test() {
a= new ArrayList();
Object o=new Object();
a.add(o);
a.add(o);
ArrayList a;
public void setA(ArrayList a) {
this.a = a;
public ArrayList getA() {
return a;
I hope this sample came handy.
regards,

Convery byte[] into a object

i have a byte[] which I have got from DB. I want to convert it into a object before returning it from a method. There is a wraaper class for byte i.e. Byte. But I am not sure tha how to convert a byte[] into an Object.
Thanks!!

georgexu316 wrote:
corlettk wrote:
georgexu316 wrote:
If you know what you are doing, you can perform an implicit conversion by casting the byte.
byte byteData = new byte();
Object newObj = (Object) byteData;
Umm.. Dude, a byte array is-an Object. In Java you don't ever need to explicitly up-cast... but (in order to actually use it as a byte array) you do have to explicitly down-cast it.
For example:
package forums;
class AByteArrayIsAnObject
public static void main(String[] args) {
try {
Object bytes = "Hello World!".getBytes(); // returns a reference to a newly created byte-array-object
System.out.println( new String((byte[])bytes) );
} catch (Exception e) {
e.printStackTrace();
Well, the person asked to convert it into an Object, maybe he needs it as a object to pass it through another parameter of another method. Even though byte is an extension of Object and you can use all of Object's methods, it wouldn't pass through a parameter of a method that specifies an object.Ummm... Wanna bet?
package forums;
class AByteArrayIsAnObjectTest
public static void main(String[] args) {
    try {
      println(new String((byte[])getBytes("Hello World!")));
    } catch (Exception e) {
      e.printStackTrace();
private static Object getBytes(String s) {
    return s.getBytes();
private static void println(Object o) {
    System.out.println(String.valueOf(o));
}

Size (in bytes) of an object? How to find?

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