- Java.io package classes
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- Java.io - ObjectInputStream
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- Java.io - ObjectStreamClass
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- Java.io - RandomAccessFile
- Java.io - Reader
- Java.io - SequenceInputStream
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- Java.io - StringBufferInputStream
- Java.io - StringReader
- Java.io - StringWriter
- Java.io - Writer
- Java.io package extras
- Java.io - Interfaces
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- Java.io package Useful Resources
- Java.io - Discussion
Java.io.RandomAccessFile.readLine() Method
Description
The java.io.RandomAccessFile.readLine() method reads the next line of text from this file. This method successively reads bytes from the file, starting at the current file pointer, until it reaches a line terminator or the end of the file. Each byte is converted into a character by taking the byte's value for the lower eight bits of the character and setting the high eight bits of the character to zero.
Declaration
Following is the declaration for java.io.RandomAccessFile.readLine() method.
public final String readLine()
Parameters
NA
Return Value
This method returns the next line of text from this file, or null if end of file is encountered before even one byte is read.
Exception
IOException − If an I/O error occurs.
Example
The following example shows the usage of java.io.RandomAccessFile.readLine() method.
package com.tutorialspoint; import java.io.*; public class RandomAccessFileDemo { public static void main(String[] args) { try { // create a new RandomAccessFile with filename test RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw"); // write something in the file raf.writeUTF("Hello World"); // set the file pointer at 0 position raf.seek(0); // print the line System.out.println("" + raf.readLine()); // set the file pointer at 0 position raf.seek(0); // write something in the file raf.writeUTF("This is an example \n Hello World"); raf.seek(0); // print the line System.out.println("" + raf.readLine()); } 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 This is an example
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