Java RandomAccessFile Example

Here you will learn about the RandomAccessFile class. In the given code, we have used BufferedWriter class to write even number between 2 and 10 into text file. Then using the RandomAccessFile, we have wrote numbers from 1 to 5. The seek() function displays the the last 3 digits of file.

Example:

import java.io.*;

class RandomAccessFileExample
{
public static void main(String[] args) 
{
try{
File f=new File("c:/num.txt");
BufferedWriter bw=new BufferedWriter(new FileWriter(f,true));
for(int i=2;i<=10;i++){
if(i%2==0){
bw.write(Integer.toString(i));
bw.newLine();
}
}
bw.close();
RandomAccessFile randomFile=new RandomAccessFile(f,"rw");
for(int i=1;i<=5;i++){
randomFile.seek(f.length());
randomFile.writeBytes(Integer.toString(i));
}
randomFile.close();
RandomAccessFile access = new RandomAccessFile(f, "r");
int i=(int)access.length();
System.out.println("Length: " + i);
access.seek(i-3); 
for(int ct = 0; ct < i; ct++){
byte b = access.readByte();
System.out.println((char)b); 
}
}
catch(Exception e){}
}
}
Output: Following data has been added to the text file 'num.txt'.
2
4
6
8
10
12345


Last three numbers from the file will get displayed on the console.
Length: 21
3
4
5







					
					

					


					
					


					
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