Write and Read to File In Java Example

import java.io.*;

public class DataIOTest {
    public static void main(String[] args) throws IOException {

        //File to start in
        DataOutputStream out = new DataOutputStream(new
				   FileOutputStream("main.txt"));

        double[] prices = { 12.45, 3.54, 23.53, 6.75, 2.53 };
        int[] units = { 12, 8, 13, 29, 50 };
        String[] descs = { " T-shirt1",
			   "T-shirt2",
			   "T-shirt3",
			   "T-shirt4",
			   "T-shirt5" };
        
        for (int i = 0; i < prices.length; i ++) {
            out.writeDouble(prices[i]);
            out.writeChar('\t');
            out.writeInt(units[i]);
            out.writeChar('\t');
            out.writeChars(descs[i]);
            out.writeChar('\n');
        }
        out.close();

        // read it in again
        DataInputStream in = new DataInputStream(new
				 FileInputStream("main.txt"));

        double price;
        int unit;
        String desc;
        double total = 0.0;

        try {
            while (true) {
                price = in.readDouble();
                in.readChar();       // skip the tab
                unit = in.readInt();
                in.readChar();       // skip the tab
                desc = in.readLine();
                System.out.println("Order " +
				    unit + " units of " +
				    desc + " at $" + price);
                total = total + unit * price;
            }
        } catch (EOFException e) {
        }
        System.out.println("Total: $" + total);
        in.close();
    }
}