Question

java

read integers from this binary file and when the value is 0 then stop reads and print its summation

here is my code

import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Random;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.FileInputStream;

class Main {
public static void main(String[] args) {
       String fname = "out.txt";
       prepare(fname);
      
       ObjectInputStream inputStream = null;
       // create code here
   }

   public static void prepare(String fname) {
       ObjectOutputStream outputStream = null;
       Random generator = new Random(30);
      
       try {
           outputStream = new ObjectOutputStream(new FileOutputStream(fname));
           for (int i = 0; i < generator.nextInt(20) + 4; i++)
               outputStream.writeInt(generator.nextInt(50000) - 25000);
           outputStream.writeInt(0);
           outputStream.close();
       }
       catch (FileNotFoundException e) {
           System.out.println("Error file " + fname);
           System.exit(0);
       }
       catch (IOException e) {
           System.out.println("Error " + fname);
           System.exit(0);
       }
   }

}

Answer 1

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.util.Random;

public class ReadIntFromBinary {
        public static void main(String[] args) throws FileNotFoundException {
                String fname = "out.txt";
                prepare(fname);
                
                long sum = 0;

                DataInputStream inputStream = new DataInputStream(new FileInputStream(fname));
                try {
                        while (true) {
                                int n = inputStream.readInt();
                                if(n == 0) {
                                        break;
                                }
                                sum += n;
                        }
                } catch (Exception e) {
                        // Read EOF 
                } finally {
                        try {
                                inputStream.close();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }
                System.out.println("The sum of the numbers is: " + sum);
        }

        public static void prepare(String fname) {
                ObjectOutputStream outputStream = null;
                Random generator = new Random(30);

                try {
                        outputStream = new ObjectOutputStream(new FileOutputStream(fname));
                        for (int i = 0; i < generator.nextInt(20) + 4; i++)
                                outputStream.writeInt(generator.nextInt(50000) - 25000);
                        outputStream.writeInt(0);
                        outputStream.close();
                } catch (FileNotFoundException e) {
                        System.out.println("Error file " + fname);
                        System.exit(0);
                } catch (IOException e) {
                        System.out.println("Error " + fname);
                        System.exit(0);
                }
        }

}

If the file does not contain any 0, then We read everything and show the sum.