New to java questions
#1. In the code below if I uncomment the try/catch surrounding the
BufferedReader I get a compile error stating "variable br might not have
been initialized"...any ideas why?
#2. In order to get this code to run I had to import FileReader.
Shouldn't FileReader have been imported with java.io.* ?
Thanks in advance. Jim
import java.io.*;
import java.io.FileReader;
class FileReaderDemo {
public static void main(String args[]) throws IOException {
String s;
FileReaderfr;
BufferedReader br;
try {
fr = new FileReader(args[0]);
} catch(ArrayIndexOutOfBoundsException e) {
System.out.println("Usage: Java FileReaderDemo file name");
return;
} catch (FileNotFoundException e) {
System.out.println("File not found");
return;
}
//try {
br = new BufferedReader(fr,100);
//} catch (IllegalArgumentException e) {
//System.out.println("Error: " + e);
//}
try {
while((s = br.readLine()) != null) {
System.out.println(s);
}
} catch (Exception e) {
System.out.println("Error: " + e);
}
fr.close();
}
}
[1218 byte] By [
j_wyanta] at [2007-10-2 0:34:20]
> #1. In the code below if I uncomment the try/catch
> surrounding the
> BufferedReader I get a compile error stating
> "variable br might not have
> been initialized"...any ideas why?
Beacause the variable might not have been initialized.
> #2. In order to get this code to run I had to import
> FileReader.
> Shouldn't FileReader have been imported with
> java.io.* ?
Only java.io.* will be enough.
This will compile(I think):
import java.io.*;
class FileReaderDemo {
public static void main(String args[]) throws IOException {
String s = "";
FileReader fr = null;
BufferedReader br = null;
try {
fr = new FileReader(args[0]);
} catch(ArrayIndexOutOfBoundsException e) {
System.out.println("Usage: Java FileReaderDemo file name");
return;
} catch (FileNotFoundException e) {
System.out.println("File not found");
return;
}
try {
br = new BufferedReader(fr,100);
} catch (IllegalArgumentException e) {
System.out.println("Error: " + e);
}
try {
while((s = br.readLine()) != null) {
System.out.println(s);
}
} catch (Exception e) {
System.out.println("Error: " + e);
}
fr.close();
}
}
> #1. In the code below if I uncomment the try/catch
> surrounding the
> BufferedReader I get a compile error stating
> "variable br might not have
> been initialized"...any ideas why?
If the BufferedReader's constructor has thrown an IllegalArgumentException
your code would have caught it, printed a message and continued,
in particular you would have attempted to apply readLine to an uninitialized br.
Perhaps you have a missing return here.
>
> #2. In order to get this code to run I had to import
> FileReader.
> Shouldn't FileReader have been imported with
> java.io.* ?
That's odd. Do you have a FileReader class accidentally defined in your directory?
