Re: write read string data
On Nov 22, 11:32 am, Lew <l...@lewscanon.com> wrote:
bH wrote:
public class GetData extends JPanel {
It doesn't look like this class "is-a" JPanel. You use no JPanel
functionality; on the contrary, all your visible output is via System.out.
Also, the intent of class names is usually clearer with a noun (DataGetter)
than a verb, which latter is good for methods.
Object[][] tempObj = new Object[5][5];
public GetData () {
Don't do major work inside a constructor.
System.out.println();
System.out.println("inside GetData");
System.out.println();
try {
FileInputStream fileIn =
new FileInputStream("C:\\myarray.data");
ObjectInputStream objInStream =
new ObjectInputStream(fileIn);
for (int ia = 0;ia<5;ia++){
for (int ib = 0;ib<5;ib++) {
tempObj[ia][ib] = objInStream.readObject();
System.out.print(tempObj[ia][ib]);
System.out.print(" ");
System.out.println();
}
}
objInStream.close();
}
catch (Exception ee) {
ee.printStackTrace();
}
}
}
One point about safety. If the readObject() call blows up, you will never
close your Streams. You should put close() calls in a finally{} block, after
the Stream is instantiated, to ensure that they really do close.
public class DataGetter
{
public void getData()
{
FileInputStream fileIn = new FileInputStream("myarray.data");
if ( fileIn == null )
{
return;
}
ObjectInputStream objIn;
try
{
objIn = new ObjectInputStream(fileIn);
}
catch( IOException ex )
{
objIn = null;
logger.log( Level.SEVERE, "Open error on object input", ex );
}
if ( objIn == null )
{
try
{
fileIn.close();
}
catch( IOException ex )
{
logger.log( Level.SEVERE, "Close error on file", ex );
}
return;
}
try
{
for (int ia = 0; ia < 5; ia++)
{
for (int ib = 0; ib < 5; ib++)
{
temp [ia] [ib] = objIn.readObject();
System.out.print( temp [ia] [ib] );
System.out.print(" ");
System.out.println();
}
}
}
catch( IOException exc )
{
logger.log( Level.SEVERE, "Processing error on object input", exc );
}
finally
{
try
{
objIn.close();
}
catch( IOException ex )
{
logger.log( Level.SEVERE, "Close error on object input", ex );
}
try
{
fileIn.close();
}
catch( IOException ex )
{
logger.log( Level.SEVERE, "Close error on file", ex );
}
}
}
}
--
Lew- Hide quoted text -
- Show quoted text -
Hi Lew,
Thanks for your prompt reply,
In between failed runs, I sometimes went to the data
file location and tossed the output file into the trash,
restarted the computer, and began again.
Never can tell what gets stuck in the mind of a Win xp
after too many test runs/errors.
Now you gave me the code to correct that, but I haven't
tested it yet.
Maybe I should exchange myself for the turkey bird
that is baking in the oven!
You wonderful "helpers" in this forum, one straightens the
bent knees, another improves the eyesight, another gets the
person to look in the correct direction. How to recall it
all? I do save the samples so that for future reference,
so I have something to fall back on just in case I need
a reference. But Win xp does a rotten job
of looking up files/words. Or maybe I have forgotten the
words to put into my 'Google Desktop" to query my files.
UGH!
I am going back into the oven. Not done yet.
Thanks again,
bH