What is a RandomAccessFile in Java?

What is a RandomAccessFile in Java?

RandomAccessFile in Java is a class that allows data to be read from and written to at any location in the file. In other simple words, RandomAccessFile class allows creating files that can be used for reading and writing data with random access.

How do you write a RandomAccessFile in Java?

Writing to a RandomAccessFile can be done using one it its many write() methods. Here is a simple example: RandomAccessFile file = new RandomAccessFile(“c:\\data\\file. txt”, “rw”); byte[] bytes = “Hello World”.

Which interface will be used for implementing a RandomAccessFile class?

io. RandomAccessFile Class provides a way to random access files using reading and writing operations. It works like an array of byte storted in the File.

How do I read a random access file in Java?

The java. io. RandomAccessFile class in Java enables you to read/write data to a random access file. This acts similar to a large array of bytes with an index or, cursor known as file pointer you can get the position of this pointer using the getFilePointer() method and set it using the seek() method.

How do I write a string in RandomAccessFile?

RandomAccessFile. writeChars(String s) method writes a string to the file as a sequence of characters. Each character is written to the data output stream as if by the writeChar method. The write starts at the current position of the file pointer.

What is the aim of the following constructor RandomAccessFile file file string mode?

Constructor. Creates a random access file stream to read from, and optionally to write to, the file specified by the File argument. Creates a random access file stream to read from, and optionally to write to, a file with the specified name.

Which interface will be used for implementing a RandomAccessFile class Mcq?

The RandomAccessFile class implements the ___and ___ interfaces. Ans. DataInput, DataOutput.

What is the aim of the following constructor RandomAccessFile file file String mode?

How can you read or write from random position in file?

In order to read from a random location, you can use seek() method to set the file pointer to a particular location in the file. By the way, if the end of the file is reached before your program reads the desired number of bytes, an EOFException will be thrown.

What is FileInputStream in Java?

A FileInputStream obtains input bytes from a file in a file system. What files are available depends on the host environment. FileInputStream is meant for reading streams of raw bytes such as image data. For reading streams of characters, consider using FileReader .

Which method of RandomAccessFile class reads a line from the file and returns it as a string?

The java. io. RandomAccessFile. readLine() method reads the next line of text from this file.

Which method of RandomAccessFile class reads a line from the file and returns it as a String?

What is difference between FileReader and FileInputStream?

FileInputStream is Byte Based, it can be used to read bytes. FileReader is Character Based, it can be used to read characters. FileInputStream is used for reading binary files. FileReader is used for reading text files in platform default encoding.

What is the difference between FileInputStream and FileOutputStream?

InputStream − This is used to read (sequential) data from a source. OutputStream − This is used to write data to a destination.

Should I use FileReader or FileInputStream?

So starting of with FileReader class in java is used to read data from the file. It returns data in byte format like FileInputStream class….Java.

What is FileInputStream and FileOutputStream in Java?

In Java, FileInputStream and FileOutputStream are byte streams that read and write data in binary format, exactly 8-bit bytes. They are descended from the abstract classes InputStream and OutputStream which are the super types of all byte streams.

What is BufferedInputStream and BufferedOutputStream?

BufferedInputStream and BufferedOutputStream use an internal array of byte, also known as buffer, to store data while reading and writing, respectively. Buffered streams are typically more efficient than similar non-buffered streams.

What is the difference between FileInputStream and ByteArrayInputStream?

The InputStream is an abstract class and ByteArrayInputStream is a concrete class of InputStream and offers its own implementation of the abstract idea given by (InputStream), In Addition : A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream.

What is the difference between FileInputStream and InputStream?

There is no real difference. FileInputStream extends InputStream , and so you can assign an InputStream object to be a FileInputStream object. In the end, it’s the same object, so the same operations will happen. This behavior is called Polymorphism and is very important in Object-Oriented Programming.

What is difference between FileInputStream and FileOutputStream?