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Questions and Answers
What type of data is typically handled by a Character Stream?
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.
A FileInputStream is used for reading character-stream data.
False (B)
What is the purpose of a FileInputStream?
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.
A FileInputStream is used to read data from a file in a ______________ manner.
Match the following I/O streams with their typical usage:
Match the following I/O streams with their typical usage:
What is the return type of a FileInputStream when reading a file?
What is the return type of a FileInputStream when reading a file?
A FileOutputStream is used for reading data from a file.
A FileOutputStream is used for reading data from a file.
What is the difference between a FileInputStream and a FileOutputStream?
What is the difference between a FileInputStream and a FileOutputStream?
What is one of the functionalities of the File class?
What is one of the functionalities of the File class?
The first statement in the File class creates a new file.
The first statement in the File class creates a new file.
What is the difference between using 'dir' and 'dirs' when creating directories?
What is the difference between using 'dir' and 'dirs' when creating directories?
The read/write methods in the Reader and Writer classes handle data ______________ at a time.
The read/write methods in the Reader and Writer classes handle data ______________ at a time.
What is the purpose of the Reader and Writer classes?
What is the purpose of the Reader and Writer classes?
The delete method deletes a directory and all its contents.
The delete method deletes a directory and all its contents.
What happens when you use 'dir' to create a directory?
What happens when you use 'dir' to create a directory?
Match the following operations with their corresponding methods:
Match the following operations with their corresponding methods:
What happens in a try-catch block when an exception is thrown in the try block?
What happens in a try-catch block when an exception is thrown in the try block?
A try-catch block can have multiple catch blocks.
A try-catch block can have multiple catch blocks.
What is the benefit of using files in a program?
What is the benefit of using files in a program?
The ______ class is a part of the Java Swing package and is used to prompt the user to choose a file or directory
The ______ class is a part of the Java Swing package and is used to prompt the user to choose a file or directory
Which of the following is a write class in Java file handling?
Which of the following is a write class in Java file handling?
Match the following Java file handling classes with their descriptions
Match the following Java file handling classes with their descriptions
A finally block is always executed, regardless of whether an exception is thrown
A finally block is always executed, regardless of whether an exception is thrown
What is the purpose of a finally block in a try-catch block?
What is the purpose of a finally block in a try-catch block?
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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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