Object[] casting to String[] ERROR

Hi! i have a LinkedBlockingQueue and by it's method .to Array() i want to cast it's type to String[] (it's initial is Object[])
But i get a ClassCastException
Help?

An Object[] is not an String[] even if it only contains String objects: The content of the array does not define the type of the array, but the type of the array limits the possible types of the content.
Look at the other .toArray() method that takes a parameter. If you put a String[] in, you get a String[] back out (you still have to cast, 'though, but then it will work).

Similar Messages

Crazy!! Tree object Casting... Error

I've created a Jtree, consisting of objects of type (String x, String y, String z), When i rename a leaf id like the first String "x" in the object to change accordingly and the rest to remain the same...
I've used a TreeModelListener with the treeNodesChanged methods to listen for a rename and the below code to change it, But i keep getting the following:-
java.lang.ClassCastException: java.lang.String
// Code
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
MObject obj = (MObject) node.getUserObject(); //error
node.setUserObject(new MObject (obj.x, obj.y, obj.z));
the casting works perfectly in other sections of the code just not here. please help Thx

pl. giv code for ur MObject and node creation

Cast Object Array to String Array.

When I try to cast an object array to string array an exception is thrown. How do I go about doing it?
Vector temp = new Vector();
Object[] array = temp.toArray();
String[] nonterms;
nonterms = (String[])array;
Thanks,
Ally

Try this
import java.util.Vector;
public class Test
     public static void main(String args[]) throws Exception
          Vector v = new Vector();
          v.add("a");
          v.add("b");
          v.add("c");
          Object[] terms = v.toArray();
          for(int i = 0; i < terms.length; i++)
               System.out.println((String)terms);
Raghu

Can you create an object from a string

I have been working on creating a dynamic form, creating the
form items from an xml file. I am getting very close to conquering
this task. I will share it when it's complete.
However, I am stuck at the moment trying to create an object
from a string. For example, if the xml item is an HBox I want to
create an HBox. Like this: parentObject = new arrayOfFormItems[
index ]..type ()
This isn't working. First, is this possible using some syntax
I am unaware of in Flex? I don't want to use a large if or case
statement if possible.
Thanks in advance for your help!

Thank you very much. Indeed that did solve the one problem. I
missed the casting as a Display Object. That is awesome!
I do still however, have to instantiate one of every item I
want to dynamically create or I get the following error when I try
to create a dynamic object that I have not instantiated before.
ReferenceError: Error #1065: Variable HBox is not defined.
at global/flash.utils::getDefinitionByName()
at MyForm/buildForm()
at DynamicForm/::onComplete()
at
flash.events::EventDispatcher/flash.events:EventDispatcher::dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at flash.net::URLLoader/flash.net:URLLoader::onComplete()
I read that you have no choice but to instantiate one of each
type to force the linker to link the code for that class into the
.swf. Unless you know another way to force it.
This is what I have in my Application mxml to get it to work:
<mx:HBox>
<mx:Text visible="false"/>
<mx:TextArea visible="false"/>
<mx:TextInput visible="false"/>
<mx:DateField visible="false"/>
</mx:HBox>
And those are the types I'm using to test with. . . I will
have to add all the others I want to use as well . . .

Object Casting

hi ,i have a question for .Base on this example below , i need to understand some casting basic .I understand how premitives values widening rules works but not on object casting rules.
Question 1.
Okay ,base on the example below why 'c=(Test) a' will always give compile error while "a=b" does not .Let takes this example , b already extends A and should have information of A class while A only have it own .I know i was thinking another way round.Can any one help.
Question 2.
How to make " c = (Test) a to run without any problem ,as long as a is assign to a is ok.
Question 3.
I have a statement from Khalid book page 202 and i don't understand .
First statement:=Conversion which preserve the inheritance is a relationship are allowed ,other conversion require an explicit case or are illegal.
Fecond statement:=There is no notion of promotion for reference values.
Question 4.
What is the benefit of using casting and when we need to use it .Can give a short example.??
class A {int Athing = 1;}
class B extends A {int Bthing = 2;}
class Test extends A
{ int Cthing = 3;
public static void main(String args[])
A a = new A();
B b = new B();
Test c = new Test();
//c = (Test) a; //runtime error
a = b;

Ron, does your mommy know you're here? Shoudn't you be out riding your bike or doing homework or watching X Men or something instead of interrupting the grown-ups?
Wikey: The answer to your question is that you can always (and implicitly) cast to a subclass because the subclass is always a member of the class, but you can't always even explicitly cast to the parent or higher class. To give a concrete example, all Toyota Camries are cars, but not all cars are Toyota Camries. There are things you can do with a Toyota Camry that you can't do with all cars. In your code, if you had coded A a = new Test();, you woudn't have a runtime error.
Doug

Type cast with string name

I have a hashtable full of Objects. I also have there type represented by a String. How can I typecast these Objects back to there type. i.e.
String str = "helpme";
str = (Object)str;
String type = "String";
can I use the var type to cast str back to a String;

I've never used reflection before so my answer maybe way off from what you're looking for.... but to solve your problem on casting an Object to a type specified by a String variable you could use a case or if statement if you know what types are available ahead of time and call the appropriate methods to return your Object type.
For example... You could create a method for each type you expect to return.
public String getStringValue( Object obj ) {
     return (String)obj;
public Integer getIntegerValue( Object obj ) {
     return (Integer)obj;
public Byte getByteValue( Object obj ) {
     return (Byte)obj;
}Then... depending on what the value of your String type variable is you can call the appropriate method that will return the Object type you're wanting.
String type = "String";
if( type.equals("String") )
     String yourStr = getStringValue(yourObject);
else if( type.equals("Integer") )
     Integer yourInt = getIntegerValue(yourObject);
else if( type.equals("Byte") )
     Byte yourByte = getByteValue(yourObject);This maybe not be the most efficient way especially since there can be potential errors but it can work assuming the String type is really representing the type of Object yourObject is.
I don't know.. just a possible solution that popped in my head.
.kim

Setting the name of a new object from a string

Is there anyway I can set the object name of a newly created
object from a string?
eg.
(the code below generates a compile time error on the
variable declaration)
public function addText(newTxt:String, txt:String,
format:TextFormat):void {
var
this[newTxt]:TextField = new TextField();
this[newTxt].autoSize = TextFieldAutoSize.LEFT;
this[newTxt].background = true;
this[newTxt].border = true;
this[newTxt].defaultTextFormat = format;
this[newTxt].text = txt;
addChild(this[newTxt]);
called using>
addText("mytxt", "test text", format);
I could then reference the object later on without using
array notation using mytxt.border = false; for example
There are many a time when I want to set the name of a new
object from a string.
In this example I have a function that adds a new text object
to a sprite.
The problem is, if I call the function more than once then
two textfield objects will exist, both with the same name. (either
that or the old one will be overwritten).
I need a way of setting the name of the textfield object from
a string.
using
var this[newTxt]:TextField = new TextField()
does not work, If I take the "var" keyword away it thinks it
a property of the class not an object.
resulting in >
ReferenceError: Error #1056: Cannot create property newTxt on
Box.
There must be a way somehow to declare a variable that has
the name that it will take represented in a string.
Any help would be most welcome
Thanks

Using:
var this[newTxt]:TextField = new TextField()
is the right approach.
You can either incrment an instance variable so that the name
is unique:
newTxt = "MyName" + _globalCounter;
var this[newTxt]:TextField = new TextField();
globalCounter ++;
Or store the references in an array:
_globalArray.push(new TextField());
Tracy

How to create a Document object from a string.

If I use the following code, the input String cannot contain "\n", otherwise, it generates errors.
in the following code, inputXMLString is a String object that has xml content.
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(inputXMLString))); How can I create a Document object from a string with "\n" in the string?
Thanks.

If I use the following code, the input String cannot
contain "\n", otherwise, it generates errors.That's going to be a huge surprise to thousands of people who process XML containing newline characters every day without errors.
Perhaps your newline characters are in the middle of element names, or something else that causes your XML to be not well-formed. I'm just guessing here, though, because you didn't say what errors you were getting.

Bad string error!

hello,
for my application, I am using combo box for displaying IP addresses.
when i go to that corresponding panel from Main Menu buy clicking 'GoToIPdiplay' menu item, the output throughs
"Object Identifier: bad string supplied to set value " error exception.
In the combo boy, the first index value i set as "Click to view avilable IPs".
after that all combo box value, i set the avilable IP values.
why in my application,
"Object Identifier: bad string supplied to set value " error exception come?.

To cater for nulls try
If isnull|( {EVAL_COMMENTS_Duration.COMMENTS}) or {EVAL_COMMENTS_Duration.COMMENTS} = '' then 0 else
Minute(CTime ("00:" + {EVAL_COMMENTS_Duration.COMMENTS}))* 60 + Second (CTime ("00:" + ({EVAL_COMMENTS_Duration.COMMENTS})))
Ian

Hi i just to want to know when we use object casting..

sorry about this newbie question i ve already asked to my tutor but
didn't get it...
i just wonder what will happen if we cast object..
i just can't imagin..coz im just bit slow on creative thinking...
my currently writing code is like this..
Integer nextCustID = new Integer("123456");
Customer customer = new Customer(nextCustID, "Fred");
customers.put("First", customer);
customer = (Customer) customers.get("First");
System.out.println(customer);i don't know about object casting...............................

You don't cast objects. You just cast references - widening or narrowing their "scope" along the inheritance hierarchy.
String s = new String("Hello");
Object o = (Object) s; // Explicit cast not necessary, just for clarification
String s = (String) o;While "hello" might appear as a String, then as an Object, then again as a String, it is always a String. Only the reference type to it changes.

(261718088) Q: Can you use xm:multiple with Objects other than String?

Q: Can you use xm:multiple with Objects other than Strings?
<br>
A: You bet. Attached find a text file with some code from the example I showed
today, a version of the multipleSayHiTo() method that has a parameter of an Array
of Person objects rather than a parameter of an Array of Strings. The code within
the text file comes from the Greeting.jws file (the Greeting Web Service).
[multiple.txt]

So you are saying that the recovery discs I made do include the copy of windows that was originally installed?
Absolutely! They will restore the hard disk to its original out-of-the-box contents. Follow the instructions in the section Restoring from recovery DVDs/media, which begins on p. 73 of the User's Guide.
Satellite A660 Series User’s Guide
maybe i can make a deal with wd to have them swap this drive out for the BEKT instead...
That would be a good idea in any case.
As I said, the 10-fc12-045d error would not be due to the drive's being AFT, but more likely the discs are not being read properly. New discs can be obtained from Toshiba. Scroll down to Get Recovery Media here
-Jerry

Possible to create an object from a String?

Hi,
is is somehow at all possible to create an object from a String ?
If we have etc.
String txt = "Carrot()";
Is it then possible to somehow cast that String and interpret it as a class type that it should make an object of ?
Like
new txt; - would then give me the same as new Carrot(); ?
Hope you understand what i mean.
Martin From... :-)

Class.forName("some.package.Carrot");

Crystal report for visual studio 2010 data source object is not valid error

Hello,
I receive an "data source object is not valid" error when I want to print one CR document after setting an ADODB.Recordset on SetDataSource method of my report.
On my developer station, this operation works without problem but on client station, I get this error.
The redistributable package for client is installed on client side (CRRuntime_32bit_13_0_1.msi).
Can someone help me?
Thank you.

Thank's for your answers
Dim rsPkLst As ADODB.Recordset = Nothing
Dim report As New crPickingList
' Fill ADODB.Recordset with SQL Statment
If rsPkLst.RecordCount > 0 Then
report.SetDataSource(rsPkLst) ' Error : The data source object is invalid
EndIf
This error appears during "report.SetDataSource(rsPkLst)" instruction.
ADODB drivers are already installed and my ADODB.Recordset is filled with good records.
This project is an updated project from Visual Studio 2003 to Visual studio 2010 and the old version was running fine.
Developer and client station runs under Windows XP SP3.
On developer side I install CRforVS_13_0_1 (BuildVersion=13.0.1.220.Cortez_CR4VS).
On client side I install CRRuntime_32bit_13_0_1.msi.
Both stations use Microsoft .Net Framework 4.
Move to ADO.NET is a solution but, for the moment, I do not have the time to change all applications from my company.
(I get this error from all application updated from VS 2003 to VS 2010 developed since 2005)
David.

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();

Object variable not set (Error 91) in Input Enabled query

Hello,
I'm having the following issue. I have created an input enabled query and included it in a planning workbook. Every time I open the workbook or query, and I got to an input enabled cell, I get the error below:
Object variable not set (Error 91)
This client has not used planning workbooks before. The system is on 7.10 SP10 for Bex Analyzer and SAP Gui 7.10 Patch Level 13.
I'm not finding any relevant so far in SDN. Any help anyone can provide is greatly appreciated.
Thanks,
Senthil

Hello,
Just wanted to let you all know that this issue has been resolved after updating my SAP Gui to 7.2 Patch Level 4 (Patch Level 5 was causing some other issues so I decided to stay at Level 4).
Thanks,
Senthil

Object[] casting to String[] ERROR

Similar Messages

Maybe you are looking for