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How to remove this issue about NumberFormatException?

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  How to remove this issue about NumberFormatException? bluestar <bluestar8783@gmail.com> - 2013-01-29 00:09 -0800
    Re: How to remove this issue about NumberFormatException? bluestar <bluestar8783@gmail.com> - 2013-01-29 01:09 -0800
      Re: How to remove this issue about NumberFormatException? Roedy Green <see_website@mindprod.com.invalid> - 2013-01-29 02:15 -0800
        Re: How to remove this issue about NumberFormatException? Arved Sandstrom <asandstrom2@eastlink.ca> - 2013-01-29 06:38 -0400
          Re: How to remove this issue about NumberFormatException? Roedy Green <see_website@mindprod.com.invalid> - 2013-01-30 04:55 -0800
            Re: How to remove this issue about NumberFormatException? Lew <lewbloch@gmail.com> - 2013-01-30 08:35 -0800
              Re: How to remove this issue about NumberFormatException? Roedy Green <see_website@mindprod.com.invalid> - 2013-01-31 04:21 -0800

#21828 — How to remove this issue about NumberFormatException?

Hi, all:

    I am rookie for coding java and I have one question about queue
class

    I use one queue class: ArrayBlockingQueue to save/get my data

    I read some data from HW and save into one ArrayBlockingQueue, and
then get from this ArrayBlockingQueue when needing. But it has one
error message: <java.lang.NumberFormatException: Invalid int:
"ffffff94"> when doing poll function

    My simple code is  below

    private ArrayBlockingQueue<Byte> iReadQueueArray = new
ArrayBlockingQueue<Byte>(READBUF_SIZE, true);

    byte[] rbuf = new byte[256];

    iReadCnt = readfromHW(rbuf, rbuf.length); <---read data from
HW
    ret = iReadQueueArray.offer( Byte.valueOf( (rbuf[i]&0xFF) ));

//-----------------------------------------------------------------------//
    public int read(byte[] buf) {
      Byte  mdata;
      ...
      mdata = (Byte)iReadQueueArray.poll(); <---occur error when
polling some data
      if( mdata!=null ) {
          buf[i] =  (byte) (mdata.byteValue()&0xFF);
      }
      ...
      return 0;
    }
//-----------------------------------------------------------------------//

    How to modify offer data into the queue and poll data from the
queue?

    Thank you for your help!

BR,
Alan

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#21829

I change queue to ArrayBlockingQueue<Integer> iReadQueueArray = new
ArrayBlockingQueue<Integer>(READBUF_SIZE, true);
But still it has the same issue

ret = iReadQueueArray.offer(new Integer((int) (rbuf[i]&0xFF)));

//-----------------------------------------------------------------------//
    public int read(byte[] buf) {
      Integer  mdata;
      ...
      mdata = (Integer)iReadQueueArray.poll();
      if( mdata!=null ) {
          buf[i] = (byte) (mdata.intValue()&0xFF);<---occur error when
casting some data
      }
      ...
      return 0;
    }
//-----------------------------------------------------------------------//

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#21831

On Tue, 29 Jan 2013 01:09:06 -0800 (PST), bluestar
<bluestar8783@gmail.com> wrote, quoted or indirectly quoted someone
who said :

>mdata.intValue()&0xFF);<---occur error when

You want to see what mdata is.  use .getClass()

from there drill down to find the data.

As far as I know, NumberFormatExceptions only happen when you convert
from String to binary.
I can't see why or where you would be doing that.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
The first 90% of the code accounts for the first 90% of the development time.
The remaining 10% of the code accounts for the other 90% of the development 
time. 
~ Tom Cargill  Ninety-ninety Law 

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#21834

On 01/29/2013 06:15 AM, Roedy Green wrote:
> On Tue, 29 Jan 2013 01:09:06 -0800 (PST), bluestar
> <bluestar8783@gmail.com> wrote, quoted or indirectly quoted someone
> who said :
>
>> mdata.intValue()&0xFF);<---occur error when
>
> You want to see what mdata is.  use .getClass()
>
> from there drill down to find the data.
>
> As far as I know, NumberFormatExceptions only happen when you convert
> from String to binary.
> I can't see why or where you would be doing that.
>
Number objects are more binary than String objects? Who knew?

An NFE is simply if the String format expected by a conversion to a 
numeric type is not correct.

As for where it's happening, it's in the error message. I'd want to see 
more of the program myself.

AHS

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#21867

On Tue, 29 Jan 2013 06:38:18 -0400, Arved Sandstrom
<asandstrom2@eastlink.ca> wrote, quoted or indirectly quoted someone
who said :

>Number objects are more binary than String objects? Who knew?

 "123"  is a string of characters. 3 x 16-bit unicodes.  int i=123 is
stored internally as 32-bit binary at run-time as is new Integer( 123
) in a protective object wrapper.

Perhaps it is my age, but it is a long standing tradition to refer
call the process as "converting character/a/alpha/ascii to binary".

Number is a general term that includes byte, int, float, double,
packed decimal, fixed length char numerics. (Think COBOL PL/I).  In
Java, Number is an abstract class with ten implementations.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
The first 90% of the code accounts for the first 90% of the development time.
The remaining 10% of the code accounts for the other 90% of the development 
time. 
~ Tom Cargill  Ninety-ninety Law 

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#21873

Roedy Green wrote:
> Arved Sandstrom wrote, quoted or indirectly quoted someone who said :
>>Number objects are more binary than String objects? Who knew?
> 
>  "123"  is a string of characters. 3 x 16-bit unicodes.  int i=123 is
> stored internally as 32-bit binary at run-time as is new Integer( 123
> ) in a protective object wrapper.

And every real programmer knows that both are binary representations at their heart.

That's all he's saying.

> Perhaps it is my age, but it is a long standing tradition to refer
> call the process as "converting character/a/alpha/ascii to binary".

A loose description. Arved's was precise.

> Number is a general term that includes byte, int, float, double,
> packed decimal, fixed length char numerics. (Think COBOL PL/I).  In
> Java, Number is an abstract class with ten implementations.

Ten implementations that you know of. There might be more.

-- 
Lew

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#21921

On Wed, 30 Jan 2013 08:35:11 -0800 (PST), Lew <lewbloch@gmail.com>
wrote, quoted or indirectly quoted someone who said :

>A loose description. Arved's was precise

He was just playing lawyerly putdown games.
-- 
Roedy Green Canadian Mind Products http://mindprod.com
The first 90% of the code accounts for the first 90% of the development time.
The remaining 10% of the code accounts for the other 90% of the development 
time. 
~ Tom Cargill  Ninety-ninety Law 

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