Object Oriented Design and Java I/O Streams Quiz

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Questions and Answers

Which abstract classes are the foundation of Java's stream-based I/O?

InputStream and OutputStream

Reader and Writer

InputStream, OutputStream, Reader, and Writer (correct)

None of the above

What is the purpose of character streams in Java?

To provide a convenient means for handling input and output of bytes

To provide a convenient means for handling input and output of characters (correct)

To handle binary data

To link streams to physical devices

What types of streams are available in Java?

Input Streams and Output Streams

Console Streams and File Streams

Byte Streams and Character Streams (correct)

Disk Streams and Network Streams

Which class allows you to read from and write to the console?

Console Signup and view all the answers

What does the readLine() method do?

Reads a string from the keyboard Signup and view all the answers

Which class is the standard error stream?

PrintStream Signup and view all the answers

What is the purpose of the hasNextX methods in the Scanner class?

To determine if a specific type of input is available Signup and view all the answers

Which two classes are the most often-used stream classes for reading and writing files in Java?

FileInputStream and FileOutputStream Signup and view all the answers

What exception is thrown if the file cannot be opened or created when using the FileOutputStream class?

FileNotFoundException Signup and view all the answers

What is the purpose of closing a file after reading or writing?

To release system resources allocated to the file Signup and view all the answers

Which feature in JDK 7 allows for automatic resource management, including automatically closing a file?

Try-with-resources Signup and view all the answers

Which class is derived from OutputStream?

PrintStream Signup and view all the answers

What does the read( ) method of BufferedReader return when the end of the stream is encountered?

-1 Signup and view all the answers

Which method of Scanner can be used to read input from the console, a file, and a string?

nextLine( ) Signup and view all the answers

What is the purpose of the printf( ) method in the Console class?

To write formatted output to the console Signup and view all the answers

Which abstract classes are the foundation of Java's stream-based I/O?

Byte Streams and Character Streams Signup and view all the answers

What is the purpose of character streams in Java?

To provide a convenient and efficient means for handling characters Signup and view all the answers

What types of streams are available in Java?

Byte Streams and Character Streams Signup and view all the answers

Which method is used to read a single byte from a file in Java?

read() Signup and view all the answers

What happens if the file specified in the FileInputStream constructor does not exist?

FileNotFoundException is thrown Signup and view all the answers

Which statement is true about the try-with-resources feature in Java?

It automatically closes a resource when it is no longer needed Signup and view all the answers

What is the purpose of the close() method in Java's file streams?

To release system resources allocated to the file Signup and view all the answers

Study Notes

Abstract Classes in Java's Stream-based I/O

InputStream and OutputStream are foundational abstract classes for byte streams.
Reader and Writer are foundational abstract classes for character streams.

Purpose of Character Streams

Character streams provide a convenient way to read and write text data, handling character encoding automatically.

Types of Streams in Java

Byte Streams: Handle raw binary data (e.g., InputStream, OutputStream).
Character Streams: Handle character data (e.g., Reader, Writer).
Filter Streams: Allow data transformation during I/O operations.

Console Input/Output Class

System.console() allows reading from and writing to the console.

readLine() Method

readLine() reads a full line of text input until a newline is encountered.

Standard Error Stream

System.err represents the standard error stream for error messages.

Scanner Class hasNextX Methods

hasNext(), hasNextInt(), hasNextLine(), etc., check for the availability of more input in various formats.

Commonly Used Stream Classes

FileInputStream and FileOutputStream are the most frequently used classes for file I/O.

Exception Handling with FileOutputStream

FileNotFoundException is thrown if the specified file cannot be opened or created when using FileOutputStream.

Purpose of Closing a File

Closing a file releases system resources, prevents data corruption, and ensures data integrity.

Automatic Resource Management in JDK 7

The try-with-resources statement automatically closes resources when they are no longer needed, simplifying exception handling.

Class Derived from OutputStream

FileOutputStream is a class that inherits from OutputStream.

BufferedReader read() Method

When the end of the stream is reached, read() returns -1, indicating no more data is available.

Scanner Input Method

The next() method can read input from the console, a file, and a string.

Purpose of printf() Method in Console Class

The printf() method formats and prints output to the console with specified formatting.

File Input Method

read() method in FileInputStream reads a single byte from a file.

Handling Non-Existent Files with FileInputStream

If the file specified in the FileInputStream constructor does not exist, a FileNotFoundException is thrown.

Try-with-Resources Feature

The try-with-resources feature ensures that all resources defined within the try statement are closed automatically.

Purpose of close() Method

The close() method in Java's file streams releases the resources associated with the stream, preventing resource leaks.

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Test your knowledge on Object Oriented Design and Java I/O Streams with this quiz. Learn about streams, their abstraction, and how they are linked to physical devices in the Java I/O system.

Object Oriented Design and Java I/O Streams Quiz

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Questions and Answers

Which abstract classes are the foundation of Java's stream-based I/O?

What is the purpose of character streams in Java?

What types of streams are available in Java?

Which class allows you to read from and write to the console?

What does the readLine() method do?

Which class is the standard error stream?

What is the purpose of the hasNextX methods in the Scanner class?

Which two classes are the most often-used stream classes for reading and writing files in Java?

What exception is thrown if the file cannot be opened or created when using the FileOutputStream class?

What is the purpose of closing a file after reading or writing?

Which feature in JDK 7 allows for automatic resource management, including automatically closing a file?

Which class is derived from OutputStream?

What does the read( ) method of BufferedReader return when the end of the stream is encountered?

Which method of Scanner can be used to read input from the console, a file, and a string?

What is the purpose of the printf( ) method in the Console class?

Which abstract classes are the foundation of Java's stream-based I/O?

What is the purpose of character streams in Java?

What types of streams are available in Java?

Which method is used to read a single byte from a file in Java?

What happens if the file specified in the FileInputStream constructor does not exist?

Which statement is true about the try-with-resources feature in Java?

What is the purpose of the close() method in Java's file streams?

Study Notes

Abstract Classes in Java's Stream-based I/O

Purpose of Character Streams

Types of Streams in Java

Console Input/Output Class

readLine() Method

Standard Error Stream

Scanner Class hasNextX Methods

Commonly Used Stream Classes

Exception Handling with FileOutputStream

Purpose of Closing a File

Automatic Resource Management in JDK 7

Class Derived from OutputStream

BufferedReader read() Method

Scanner Input Method

Purpose of printf() Method in Console Class

File Input Method

Handling Non-Existent Files with FileInputStream

Try-with-Resources Feature

Purpose of close() Method

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