Thread: How to Write and Read Binary Data

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
 
public class TEST {
 
    public static void main(String args[]) throws FileNotFoundException, IOException {
        TEST t = new TEST();
        t.Read();
    }
 
    public void Write() throws FileNotFoundException, IOException {
        DataOutputStream dos = new DataOutputStream(new FileOutputStream("Data.bin"));
 
        double price[] = {950, 450, 6};
        int units[] = {3, 6, 9};
        String itemDisc[] = {"IPOD", "CD Player", "HeadPhone"};
 
        for (int x = 0; x < 3; x++) {
            //Write Price
            dos.writeDouble(price[x]);
            System.out.println(price[x] + " Has been written...");
            dos.writeChar('\t');
            System.out.println('\t' + " Has been written...");
 
            //Write Units
            dos.writeInt(units[x]);
            System.out.println(units[x] + " Has been written...");
            dos.writeChar('\t');
            System.out.println('\t' + " Has been written...");
 
            //Write Item Description
            dos.writeChars(itemDisc[x]);
            System.out.println(itemDisc[x] + " Has been written...");
            dos.writeChar('\t');
            System.out.println('\t' + " Has been written...");
        }
 
        dos.close();
    }
 
    public void Read() throws FileNotFoundException, IOException {
        DataInputStream dis = new DataInputStream(new FileInputStream("Data.bin"));
        double price;
        int unit;
        StringBuffer item;
        double totalInv = 0;
 
        char lineSep = '\t';
 
        try {
            while (true)
            {
                price = dis.readDouble();
                dis.readChar();//Ignore tab character...
 
                unit = dis.readInt();
                dis.readChar();//Ignore tab character...
 
                char chr;
                item = new StringBuffer(20);
                //Read item
                while ((chr = dis.readChar()) != lineSep) {
                    item.append(chr);
                }
 
                System.out.println("You've ordered " +
                        unit + " units of " +
                        item.toString() + " at $" + price);
                totalInv += (unit * price);
            }
 
        } catch (IOException ex) {
        } finally {
            if (totalInv > 0) {
                System.out.println("Total Invoice amount is :" + totalInv);
            }
            dis.close();
        }
 
    }
}