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Java.io.RandomAccessFile.readFully() Method
Description
The java.io.RandomAccessFile.readFully(byte[] b) method reads b.length bytes from this file into the byte array, starting at the current file pointer. This method reads repeatedly from the file until the requested number of bytes are read.
Declaration
Following is the declaration for java.io.RandomAccessFile.readFully() method.
public final void readFully(byte[] b)
Parameters
b-- the buffer into which the data is read.
Return Value
This method does not return a value.
Exception
IOException − If an I/O error occurs.Not thrown if end-of-file has been reached.
EOFException − If this file reaches the end before reading all the bytes.
Example
The following example shows the usage of java.io.RandomAccessFile.readFully() method.
package com.tutorialspoint; import java.io.*; public class RandomAccessFileDemo { public static void main(String[] args) { try { // create a string and a byte array String s = "Hello world"; // create a new RandomAccessFile with filename test RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw"); // write something in the file raf.writeUTF(s); // set the file pointer at 0 position raf.seek(0); // create an array equal to the length of raf byte[] arr = new byte[(int) raf.length()]; // read the file raf.readFully(arr); // create a new string based on arr String s2 = new String(arr); // print it System.out.println("" + s2); } catch (IOException ex) { ex.printStackTrace(); } } }
Assuming we have a text file c:/test.txt, which has the following content. This file will be used as an input for our example program −
ABCDE
Let us compile and run the above program, this will produce the following result −
Hello world