Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;

public class Main {
    public static void main(String[] args) throws IOException {
        String fileName = "randomaccessfile.txt";
        File fileObject = new File(fileName);

        if (!fileObject.exists()) {
            initialWrite(fileName);
        }
        readFile(fileName);
        readFile(fileName);
    }

    public static void readFile(String fileName) throws IOException {
        RandomAccessFile raf = new RandomAccessFile(fileName, "rw");
        int counter = raf.readInt();
        String msg = raf.readUTF();

        System.out.println(counter);
        System.out.println(msg);
        incrementReadCounter(raf);
        raf.close();
    }

    public static void incrementReadCounter(RandomAccessFile raf) throws IOException {
        long currentPosition = raf.getFilePointer();
        raf.seek(0);
        int counter = raf.readInt();
        counter++;
        raf.seek(0);
        raf.writeInt(counter);
        raf.seek(currentPosition);
    }

    public static void initialWrite(String fileName) throws IOException {
        RandomAccessFile raf = new RandomAccessFile(fileName, "rw");
        raf.writeInt(0);
        raf.writeUTF("Hello world!");
        raf.close();
    }
}