Java Program Read and Write to a Binary File example

import java.io.*; public class BinaryFileExample { public static void main(String[] args) throws Exception { // file extension can be anything doesn't matter FileOutputStream fileOutputStream = new FileOutputStream("test.obj"); DataOutputStream out = new DataOutputStream(fileOutputStream); // generally custom objects are stored in binary format like image, video, game data etc // decide how data need to be stored in binary file // we will store a list of 3 student info, Name and then Roll Number out.writeUTF("Hamid"); out.writeInt(1); out.writeUTF("Rohan"); out.writeInt(2); out.writeUTF("Shubham"); out.writeInt(3); out.close(); // close the stream // Now reading from same file we created, We should know the format in which the binary file was created // first is name then is roll number, if we try first roll number then name we get error FileInputStream fileInputStream = new FileInputStream("test.obj"); DataInputStream in = new DataInputStream(fileInputStream); try { while (true) { String name = in.readUTF(); int rollNumber = in.readInt(); System.out.println("Name = " + name + " Roll Number = " + rollNumber); } } catch (EOFException e) { System.out.println("Finished reading file"); } in.close(); } }

Read Binary File in Java
Write Binary File in Java Example