Java File Handling and Exception Handling

Questions and Answers

What type of data is typically handled by a Character Stream?

Image, Video, Audio

Textual data (correct)

Byte-oriented data

All of the above

A FileInputStream is used for reading character-stream data.

False

What is the purpose of a FileInputStream?

Reading byte-oriented data from a file

A FileInputStream is used to read data from a file in a ______________ manner.

byte-oriented Signup and view all the answers

Match the following I/O streams with their typical usage:

Byte Stream = Image, Video, Audio Character Stream = Textual data FileInputStream = Reading data from a file FileOutputStream = Writing data to a file Signup and view all the answers

What is the return type of a FileInputStream when reading a file?

The ASCII value of the character read Signup and view all the answers

A FileOutputStream is used for reading data from a file.

False Signup and view all the answers

What is the difference between a FileInputStream and a FileOutputStream?

A FileInputStream is used for reading data from a file, while a FileOutputStream is used for writing data to a file. Signup and view all the answers

What is one of the functionalities of the File class?

All of the above Signup and view all the answers

The first statement in the File class creates a new file.

False Signup and view all the answers

What is the difference between using 'dir' and 'dirs' when creating directories?

Using 'dir' creates only the first folder, while using 'dirs' creates multiple directories. Signup and view all the answers

The read/write methods in the Reader and Writer classes handle data ______________ at a time.

one byte Signup and view all the answers

What is the purpose of the Reader and Writer classes?

To handle string-based data Signup and view all the answers

The delete method deletes a directory and all its contents.

True Signup and view all the answers

What happens when you use 'dir' to create a directory?

Only the first folder is created. Signup and view all the answers

Match the following operations with their corresponding methods:

Create a new directory = mkdir Create a new file = createNewFile Delete a file = delete List the contents of a directory = listFiles Signup and view all the answers

What happens in a try-catch block when an exception is thrown in the try block?

The catch block is executed, and then the program continues. Signup and view all the answers

A try-catch block can have multiple catch blocks.

True Signup and view all the answers

What is the benefit of using files in a program?

To permanently store data for later usage Signup and view all the answers

The ______ class is a part of the Java Swing package and is used to prompt the user to choose a file or directory

JFileChooser Signup and view all the answers

Which of the following is a write class in Java file handling?

FileOutputStream Signup and view all the answers

Match the following Java file handling classes with their descriptions

FileInputStream = For reading files FileOutputStream = For writing files BufferedReader = For reading text files FileWriter = For writing text files Signup and view all the answers

A finally block is always executed, regardless of whether an exception is thrown

True Signup and view all the answers

What is the purpose of a finally block in a try-catch block?

To execute code that must be executed regardless of whether an exception is thrown Signup and view all the answers

Study Notes

Exception Handling

A try-catch block can have a finally block that always executes, regardless of an exception being thrown or not
The finally block is optional, but it must appear after the catch block
If there are multiple catch blocks, the finally block must appear after the last catch block

File Handling

File Handling in Java is done using the java.io package
It is used for permanent storage of data, as data is lost when a program exits
Files can be used for both input and output operations

JFileChooser

JFileChooser is a part of the Java Swing package
It provides an easy way to prompt the user to choose a file or directory
Constructors for JFileChooser include:
- JFileChooser() - points to the user's default directory
- JFileChooser(String) - uses the given path
- JFileChooser(File) - uses the given File as a path

File Class

The File class contains several methods for working with:
- Pathname
- Deleting and renaming files
- Creating new directories
- Listing the contents of a directory
- Determining common attributes of files and directories
The File class does not create a new file, but rather instantiates an instance of the File class
The mkdir() method creates a new directory
The mkdirs() method creates multiple directories

Reader and Writer Classes

The FileReader and FileWriter classes are used for reading and writing character-based data
The read() method reads a single character and returns it as an integer
The write() method writes a single-character

I/O Streams

There are two types of I/O streams: byte streams (binary) and character streams
Byte streams are used for binary data such as images, videos, and audio
Character streams are used for textual data
I/O streams have input streams and output streams
Abstract classes for I/O streams include Reader and Writer
Methods for I/O streams include read() and write()

FileInputStream and FileOutputStream

FileInputStream is used for reading byte-oriented data from a file
FileOutputStream is used for writing byte-oriented data to a file
Reading data from a file is done byte by byte

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Description

This quiz covers Java concepts related to file handling, exception handling and input/output operations. It tests understanding of try-catch blocks, finally clause and file input/output streams.