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Time: 2013-05-19, 07:38pm

Free2Code » Forums » Java (Archived) » java file output

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java file output

Anonymous Coward

Subject: java file output · Posted: 2003-10-09, 04:35am

Rank: Unregistered

i am attempting to write information to a file with this function

Code:

public void save()
{
try
{
FileOutputStream fileOutputStream = new FileOutputStream("datafile.dat");
PrintWriter printWriter = new PrintWriter(fileOutputStream, true);
String [] th = new String[5];
for(int i = 0; i < studentCount; i++)
{
th = students[i].fOutput();
for(int j = 0; j < 5; j++)
printWriter.print(th[j]);
}
fileOutputStream.close();
}
catch(IOException e)
{
messageBox("Error opening file " + e.toString());
}
}

this will create the file if it is not created, but it will not save information when the function is run

however, if i insert information into the file manually, it will be brought into the program by my read function, which is nearly identical

Code:

public void read()
{
try
{
FileInputStream stream = new FileInputStream("datafile.dat");
InputStreamReader iStrReader = new InputStreamReader(stream);
BufferedReader reader = new BufferedReader(iStrReader);
String [] line = new String [4];
String gfl = new String();
gfl = reader.readLine();
while(gfl != null)
{
for(int i = 0; i < 4; i++)
line[i] = reader.readLine();
Student stu = new Student(line[0], line[1], line[2], line[3]);
students[studentCount] = stu;
gfl = reader.readLine();
studentCount++;
}
stream.close();
}
catch(IOException e)
{
messageBox("Error opening file " + e.toString());
}
}

any help is appreciated

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misterhaan

Subject: Re: java file output · Posted: 2003-10-10, 03:25am

Rank: ? (4827)
Member #: 3416

i added code tags to make that post easier to read.

line 10 in the write to a file code tries to loop based on studentCount, which has not been defined. it shouldn't compile if you didn't have it declared somewhere, but i don't see it declared in the function or getting passed in. also it doesn't look like it's a constant. i would expect that to be your problem though, that it's seeing that value as a 0 so it never executes the body of the loop.

my mind is like a steel trap! it only hangs on to the big stuff. visit my forums at track7.org

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