Java File Handling and Exception Handling
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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.

    <p>byte-oriented</p> Signup and view all the answers

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

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

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

    <p>The ASCII value of the character read</p> Signup and view all the answers

    A FileOutputStream is used for reading data from a file.

    <p>False</p> Signup and view all the answers

    What is the difference between a FileInputStream and a FileOutputStream?

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

    What is one of the functionalities of the File class?

    <p>All of the above</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

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

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

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

    <p>one byte</p> Signup and view all the answers

    What is the purpose of the Reader and Writer classes?

    <p>To handle string-based data</p> Signup and view all the answers

    The delete method deletes a directory and all its contents.

    <p>True</p> Signup and view all the answers

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

    <p>Only the first folder is created.</p> Signup and view all the answers

    Match the following operations with their corresponding methods:

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

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

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

    A try-catch block can have multiple catch blocks.

    <p>True</p> Signup and view all the answers

    What is the benefit of using files in a program?

    <p>To permanently store data for later usage</p> 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

    <p>JFileChooser</p> Signup and view all the answers

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

    <p>FileOutputStream</p> Signup and view all the answers

    Match the following Java file handling classes with their descriptions

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

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

    <p>True</p> Signup and view all the answers

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

    <p>To execute code that must be executed regardless of whether an exception is thrown</p> 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.

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