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Java.io.RandomAccessFile.writeLong() Method
Description
The java.io.RandomAccessFile.writeLong(long v) method writes a long to the file as eight bytes, high byte first. The write starts at the current position of the file pointer.
Declaration
Following is the declaration for java.io.RandomAccessFile.writeLong() method.
public final void writeLong(long v)
Parameters
v − a long value to be written.
Return Value
This method does not return a value.
Exception
IOException − If an I/O error occurs.
Example
The following example shows the usage of java.io.RandomAccessFile.writeLong() method.
package com.tutorialspoint; import java.io.*; public class RandomAccessFileDemo { public static void main(String[] args) { try { long f = 184750874576l; // create a new RandomAccessFile with filename test RandomAccessFile raf = new RandomAccessFile("c:/test.txt", "rw"); // write a long in the file raf.writeLong(f); // set the file pointer at 0 position raf.seek(0); // read long System.out.println("" + raf.readLong()); // set the file pointer at 0 position raf.seek(0); // write a long at the start raf.writeLong(20000000000l); // set the file pointer at 0 position raf.seek(0); // read long System.out.println("" + raf.readLong()); } 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 −
184750874576 20000000000
java_io_randomaccessfile.htm
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