Skip to main content\(
\newcommand{\lt}{<}
\newcommand{\gt}{>}
\newcommand{\amp}{&}
\definecolor{fillinmathshade}{gray}{0.9}
\newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}}
\)
Section 8.6 Summary & Reading Questions
-
To work with files in Java, you must import specific classes like
java.io.File,
java.io.FileWriter, and handle exceptions such as
IOException.
-
You can create a new file using
File.createNewFile(), which returns
true if the file is created and
false if it already exists.
-
Reading from files is done using a
Scanner attached to a
File, often with a loop using
hasNextLine() and
nextLine().
-
To write to a file, use a
FileWriter object and call methods like
write() and
close() to save and finish the output.
-
You can delete a file using the
delete() method on a
File object, which returns
true if successful.
Reading Questions Reading Questions
1.
Which import is needed to create and manipulate files in Java?
No, File is part of the java.io package, not java.util.
Correct! File is found in the java.io package.
No, this is not a valid import for file operations.
No, there is no such package in Java.
2.
What does
myFile.createNewFile() return if the file already exists?
No, it only throws an exception for access errors, not for existing files.
Correct! It returns false if the file already exists.
No, true is returned only when the file is successfully created.
No, null is not a valid return value for this method.
3.
Which method checks if a file has more lines to read using a Scanner?
No, nextLine() retrieves the next line, but does not check for availability.
No, this is not a method of Scanner.
Correct! This checks if there is another line available to read.
No, this is not a standard method in the Scanner class.
You have attempted
of
activities on this page.
