How do I Convert an "Object" to a "double"?

Can anyone please tell me how to convert an "Object" to a "double"? Typecasting does not work.

Do you want to convert any object at all to a double, or only particular kinds of objects? My guess is that you don't really need to convert a File or a JButton to a double, you have some kind of an object that really contains some sort of double information and you want to get it out. More information would help.

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How can i convert an object to stream of chars or bytes?

how can i convert an object to stream of chars or bytes?

One way is the serialization mechanism. There are examples and explanations of it in the Java tutorial: http://java.sun.com/docs/books/tutorial/essential/io/serialization.html

How do i convert an object into a string?

has said above, im trying to convert a object to a string.
here is what i ahve so far:
Object nodeInfo = node.getUserObject()

RTFM
Object o =...
String str = o.toString();

How can I convert table object into table record format?

I need to write a store procedure to convert table object into table record. The stored procedure will have a table object IN and then pass the data into another stored procedure with a table record IN. Data passed in may contain more than one record in the table object. Is there any example I can take a look? Thanks.

I'm afraid it's a bit labourious but here's an example.
I think it's a good idea to work with SQL objects rather than PL/SQL nested tables.
SQL> CREATE OR REPLACE TYPE emp_t AS OBJECT
2      (eno NUMBER(4)
3      , ename VARCHAR2(10)
4      , job VARCHAR2(9)
5      , mgr NUMBER(4)
6      , hiredate DATE
7      , sal NUMBER(7,2)
8      , comm NUMBER(7,2)
9      , deptno NUMBER(2));
10 /
Type created.
SQL> CREATE OR REPLACE TYPE staff_nt AS TABLE OF emp_t
2 /
Type created.
SQL> Now we've got some Types let's use them. I've only implemented this as one public procedure but you can see the principles in action.
SQL> CREATE OR REPLACE PACKAGE emp_utils AS
2      TYPE EmpCurTyp IS REF CURSOR RETURN emp%ROWTYPE;
3      PROCEDURE pop_emp (p_emps in staff_nt);
4 END emp_utils;
5 /
Package created.
SQL> CREATE OR REPLACE PACKAGE BODY emp_utils AS
2      FUNCTION emp_obj_to_rows (p_emps IN staff_nt) RETURN EmpCurTyp IS
3          rc EmpCurTyp;
4      BEGIN
5          OPEN rc FOR SELECT * FROM TABLE( CAST ( p_emps AS staff_nt ));
6          RETURN rc;
7      END emp_obj_to_rows;
8      PROCEDURE pop_emp (p_emps in staff_nt) is
9          e_rec emp%ROWTYPE;
10          l_emps EmpCurTyp;
11      BEGIN
12          l_emps := emp_obj_to_rows(p_emps);
13          FETCH l_emps INTO e_rec;
14          LOOP
15              EXIT WHEN l_emps%NOTFOUND;
16              INSERT INTO emp VALUES e_rec;
17              FETCH l_emps INTO e_rec;
18          END LOOP;
19          CLOSE l_emps;
20      END pop_emp;
21 END;
22 /
Package body created.
SQL>Looks good. Let's see it in action...
SQL> DECLARE
2      newbies staff_nt := staff_nt();
3 BEGIN
4      newbies.extend(2);
5      newbies(1) := emp_t(7777, 'APC', 'CODER', 7902, sysdate, 1700, null, 40);
6      newbies(2) := emp_t(7778, 'J RANDOM', 'HACKER', 7902, sysdate, 1800, null, 40);
7      emp_utils.pop_emp(newbies);
8 END;
9 /
PL/SQL procedure successfully completed.
SQL> SELECT * FROM emp WHERE deptno = 40
2 /
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM
    DEPTNO
      7777 APC        CODER           7902 17-NOV-05       1700
        40
      7778 J RANDOM   HACKER          7902 17-NOV-05       1800
        40
SQL>     Cheers, APC

How do I convert an Object into an Array?

If I have an instance of type object that I know is really a DataGrid row that was cast into an object when passed to a function, how can I cast that Object to an array, such that each index of this array would correspond to the information in a given column of the row?

@Sathyamoorthi
Can you please explain what this function does? Essentially, what should be contained in the String?
I printed out the string and it seems like I am getting a random row in the Object, as opposed to first or last. Why is that?
UPDATE: I printed out the value of dataGrid0.columns[5].dataField but it just turned out to be the id of the column.

How do you convert this String into a double?

Hi, in this code I want to convert String arg into a double. I'm trying to do this so that I can convert some string into a double in this calculator that I'm making. Here is the code:
public class par {
public static void main(String[] args) {
String str = "351";
double arg = new double(str); // should convert the string into a double
System.out.println(arg);
System.out.println(str);
I keep getting errors in line 4, if any of you could help me out here I'll be thankful, i'm kinda new to java and my search for java's equivalent of alof() (its a function in C libraries that converts char[] into a double)lead me to this.
Tony L.

Use the Following:
String num = "123.2";
double d = Double.parseDouble(num);

How do I convert a string to a double, a number loses the precision

I tried converting a string to a double but that limits the precision. I need to convert a string to a double.

If you use the Scan From String function, the default is to convert to a dbl. If you're looking at a front panel indicator, don't confuse the format and precision of the indicator with the type representation. You can set the indicator to display as many digits as you want but that doesn't change the actal number stored in memory.

How can i convert the object to class~~~????

recently i develop UML drawing tool for drawing UML diagram, i now design a program structure. now i have already defined many classes that represent each shape in UML. each class stores data of the related shape. then i use a vector to store all shape as follow;
Vector shape = new Vector();
shape.addElement(useCase); \\useCase is a Class i defined
shape.addElement(actor);\\actor is a Class i defined
now i want to use all shape's methods stored in the vector before how can i do that in general ways?
i don't want to code like this;
Object o = shape.elementAt(a);
if (o instanceof UseCase)
if (o instanceof Actor)
because i have many classed!! can u all professional help me? i am just a beginer of java programming student

Sounds like you need to use an inheritance structure...
Setup a generic class that contains methods (probably blank) which each class (such as actor, useCase) will inherit from. Then make actor/useCase inherit from this base class and provide specific code in each of the general methods.
Then when you retrieve your object from the class, you can cast it as your generic class and access the general methods without caring what the actual class is.
Eg. Basic class "shape". has empty methods "draw" and "setPosition". Class "circle" and "square" both extend "shape" and provide specific implementations of setPosition and draw methods. You can then cast them as class type shape and do draw() and setPosition methods without caring about what type the object actually is.

How to convert an object to double

how can i convert an Object into double?
do i need to import anything?

I think you mean, such a thing:
Object obj;
obj=new Double(3.14159);
double value=obj.doubleValue();//possible
obj=new Object();
value=obj; //not possible!!!!!!!!!!!!!!
In this case, the static type of obj is Object but the dynamic type is Double. Double is the "wrapper"-class for the variable-type double. For all variable-types is a wrapper-class existing. This is only for one reason that you can store "Values" within an Object Instance.
Hope this helps
chris

How to convert an Object to byte[]

How do I convert an object to a byte array without using the ObjectOutputStream?
I need to send an object over UDP socket which only works with byte[].

instead of serialisation for complex object i usexm and sax to transfer information over the network,
it works great
works nothing when transfering over the ORBWhen programming with a socket, sendTo is a standard function used in the connectionless protocol. I rewrote this function so as to be able to transmit objects. The following code example shows how to implement the send method in a Sender class:
import java.io.*;
import java.net.*;
public class Sender
{ public void sendTo(Object o, String hostName, int desPort)
{    try
{      InetAddress address = InetAddress.getByName(hostName);
ByteArrayOutputStream byteStream = new
ByteArrayOutputStream(5000);
ObjectOutputStream os = new ObjectOutputStream(new
BufferedOutputStream(byteStream));
os.flush();
os.writeObject(o);
os.flush();
//retrieves byte array
byte[] sendBuf = byteStream.toByteArray();
DatagramPacket packet = new DatagramPacket(
sendBuf, sendBuf.length, address, desPort);
int byteCount = packet.getLength();
dSock.send(packet);
os.close();
catch (UnknownHostException e)
System.err.println("Exception: " + e);
e.printStackTrace(); }
catch (IOException e) { e.printStackTrace();
The code listing below demonstrates how to implement a receive method in a Receiver class. Method recvObjFrom is for the receiver to receive the object. You can include this method in your code to receive runtime objects.
import java.io.*;
import java.net.*;
public class Receiver
{ public Object recvObjFrom()
{    try
byte[] recvBuf = new byte[5000];
DatagramPacket packet = new DatagramPacket(recvBuf,
recvBuf.length);
dSock.receive(packet);
int byteCount = packet.getLength();
ByteArrayInputStream byteStream = new
ByteArrayInputStream(recvBuf);
ObjectInputStream is = new
ObjectInputStream(new BufferedInputStream(byteStream));
Object o = is.readObject();
is.close();
return(o);
catch (IOException e)
System.err.println("Exception: " + e);
e.printStackTrace();
catch (ClassNotFoundException e)
{ e.printStackTrace(); }
return(null); }
One may worry about the size of the byte array -- because when you construct ByteArrayOutputStream or ByteArrayInputStream, you have to specify the size of the array. Since you don't know the size of a runtime object, you will have trouble specifying that size. The size of a runtime object is often unpredictable. Fortunately, Java's ByteArrayInputStream and ByteArrayOutputStream classes can extend their sizes automatically whenever needed.
By
Sree Visveswaran

Converting Array Objects into ArrayCollections

Hi,
I am facing problem with converting Array Objects into ArrayCollections. How can i convert Array Objects into ArrayCollections. If any one knows how can we do that Pl reply.
Thanks in advance to all
Regards
subbareddy.p

Hi Bhasker,
thanks for u r reply. Here i attached screen shot of my server "data.result".
My proxy varaible contains
My object varaible "obj" contains
After parsing the result my arraycollection contains, (i mean after converting Object to Array to ArrayCollection) the below information. For information Pl find the attached arraycollection.png image. In the attached image my arraycollection name is "users".
Here i pasted the code that i used to convert "ObjectProxy" to "ArrayCollection"
var proxy:ObjectProxy = ObjectProxy(data.result);
            var obj:Object = proxy.object_proxy::object;
            var arrycoll:Array = ArrayUtil.toArray(obj);
            model.users = new ArrayCollection(arrycoll);
Regards
sss

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 can i convert object to byte array very*100 fast?

i need to transfer a object by datagram packet in embeded system.
i make a code fallowing sequence.
1) convert object to byte array ( i append object attribute to byte[] sequencailly )
2) send the byte array by datagram packet ( by JNI )
but, it's not satisfied my requirement.
it must be finished in 1ms.
but, converting is spending 2ms.
network speed is not bottleneck. ( transfer time is 0.3ms and packet size is 4096 bytes )
Using ObjectOutputStream is very slow, so i'm using this way.
is there antoher way? or how can i improve?
Edited by: JongpilKim on May 17, 2009 10:48 PM
Edited by: JongpilKim on May 17, 2009 10:51 PM
Edited by: JongpilKim on May 17, 2009 10:53 PM

thanks a lot for your reply.
now, i use udp socket for communication, but, i must use hardware pci communication later.
so, i wrap the communication logic to use jni.
for convert a object to byte array,
i used ObjectInputStream before, but it was so slow.
so, i change the implementation to use byte array directly, like ByteBuffer.
ex)
public class ByteArrayHelper {
private byte[] buf = new byte[1024];
int idx = 0;
public void putInt(int val){
buf[idx++] = (byte)(val & 0xff);
buf[idx++] = (byte)((val>>8) & 0xff);
buf[idx++] = (byte)((val>>16) & 0xff);
buf[idx++] = (byte)((val>>24) & 0xff);
public void putDouble(double val){ .... }
public void putFloat(float val){ ... }
public byte[] toByteArray(){ return this.buf; }
public class PacketData {
priavte int a;
private int b;
public byte[] getByteArray(){
ByteArrayHelper helper = new ByteArrayHelper();
helper.putInt(a);
helper.putInt(b);
return helper.toByteArray();
but, it's not enough.
is there another way to send a object data?
in java language, i can't access memory directly.
in c language, if i use struct, i can send struct data to copy memory by socket and it's very fast.
Edited by: JongpilKim on May 18, 2009 5:26 PM

How to Convert Date Object at Universe Level with out Timestamp

Hi,
I have a Object called "PCREGISTERDATE" at universe where the data type is date .but the dates are coming in the following format:9/26/2007 9:48:40 PM but i want to show the date as with out time stamp.
how can i create a object by at universelevel which shoul show only date with out Time Stamp.
please help me on this ASAP.
Thanks & Regards,
Kumar

Please try below date fucntion:
select convert(varchar(10),getdate(),101) - this is for sybase
syntex will change based on your source database.
Thanks
Ponnarasu .K

How do I convert a condition integer to an object

I have a condition integer for conditional text that is applied to text. How do I convert the integer to a Condition Format object? Thanks in advance.
Rick Quatro

Rick,
It appears that Jang's idea is the general solution to converting an FDK object handle integer to an ES object. I imaging you were probably following this thread already, but this was the general answer to the same question about a document object.
http://forums.adobe.com/message/4476098
Russ

How do I Convert an "Object" to a "double"?

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