Question

Which of the following classes accept string name as filename? a. FileInputStream b. FileReader c. RandomAccessFile d. All of the above

Short answer

All of the above.

Step-by-step solution

Understand the question

Determine which Java classes can accept a string parameter as a filename for their constructors or methods.

Check FileInputStream

Verify if FileInputStream accepts a string as a filename. It does, as one of its constructors is FileInputStream(String name).

Check FileReader

Verify if FileReader accepts a string as a filename. It does, as one of its constructors is FileReader(String fileName).

Check RandomAccessFile

Verify if RandomAccessFile accepts a string as a filename. It does, as one of its constructors is RandomAccessFile(String name, String mode).

Consolidate findings

Since FileInputStream, FileReader, and RandomAccessFile all accept a string as a filename, the answer is 'All of the above'.

Key concepts

FileInputStream

Java's FileInputStream class is used for reading data from a file in the form of bytes. It is a part of java.io package and is essential when you need to read raw binary data, such as image files or audio files. One of the constructors for FileInputStream accepts a string parameter, which is the name of the file to be read.
For example: FileInputStream fis = new FileInputStream('example.txt');
This line of code will open the file named 'example.txt' for reading. When using FileInputStream, remember to close the input stream after you're done to free up resources. You can achieve this by calling the close() method.
Here are some key points about FileInputStream

• Used for reading binary data
• Belongs to java.io package
• Requires handling of IOExceptions

This class is great for scenarios where you need to read byte-oriented data from files.

FileReader

The FileReader class in Java is intended for reading streams of characters from a file. It is a good choice when dealing with text files. Similar to FileInputStream, FileReader accepts a string parameter in one of its constructors:
FileReader fr = new FileReader('example.txt');
This statement creates a FileReader to read the 'example.txt' file. FileReader is often paired with BufferedReader for efficient reading of text data. This combo helps read lines of text in a memory-efficient manner.
Important points about FileReader:

• Used for reading character-based data
• Part of java.io package
• Handles IOException

It's the right tool for reading text files, scripts, or any other type of file containing textual data.

RandomAccessFile

The RandomAccessFile class is a powerful Java feature for both reading and writing data to a file. Unlike the other two classes, RandomAccessFile isn't limited to sequential file access.
You can move to any position in the file and start reading or writing data. This makes it suitable for applications that need to read from or write to specific locations within a file. It has a constructor that accepts a string for the file name:
RandomAccessFile raf = new RandomAccessFile('example.txt', 'rw');
The string 'rw' in the constructor ensures that the file is opened in read and write mode.
Key features of RandomAccessFile:

• Supports both reading and writing
• Allows non-sequential access
• Part of java.io package

This class is ideal for applications like databases or file-based indexes that require jumping to various file locations.