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OnJava8-Examples/exceptions/InputFile.java at master · CSapprenticeWT/OnJava8-Examples · GitHub
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InputFile.java
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exceptions
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InputFile.java
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// exceptions/InputFile.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Paying attention to exceptions in constructors
import
java
.
io
.*;
public
class
InputFile
{
private
BufferedReader
in
;
public
InputFile
(
String
fname
)
throws
Exception
{
try
{
in
=
new
BufferedReader
(
new
FileReader
(
fname
));
// Other code that might throw exceptions
}
catch
(
FileNotFoundException
e
) {
System
.
out
.
println
(
"Could not open "
+
fname
);
// Wasn't open, so don't close it
throw
e
;
}
catch
(
Exception
e
) {
// All other exceptions must close it
try
{
in
.
close
();
}
catch
(
IOException
e2
) {
System
.
out
.
println
(
"in.close() unsuccessful"
);
}
throw
e
;
// Rethrow
}
finally
{
// Don't close it here!!!
}
}
public
String
getLine
() {
String
s
;
try
{
s
=
in
.
readLine
();
}
catch
(
IOException
e
) {
throw
new
RuntimeException
(
"readLine() failed"
);
}
return
s
;
}
public
void
dispose
() {
try
{
in
.
close
();
System
.
out
.
println
(
"dispose() successful"
);
}
catch
(
IOException
e2
) {
throw
new
RuntimeException
(
"in.close() failed"
);
}
}
}
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