DataInputStream & DataOutputStream;

 

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class DataStream {
    public static void main(String[] args) throws IOException {
        DataOutputStream out = new DataOutputStream(new FileOutputStream(
                "Java2s.txt"));

        double[] prices = { 19.99, 9.99, 15.99, 3.99, 4.99 };
        int[] units = { 12, 8, 13, 29, 50 };
        String[] descs = { "Java", "Source", "and", "Support" , "last"};
        byte[] data = new byte[4];
        
        for (int i = 0; i < 4; i++)
        {
            data[i] = 101;
        }

        for (int i = 0; i < prices.length; i++) {
            out.writeDouble(prices[i]);
            out.writeChar('\t');
            out.writeInt(units[i]);
            out.writeChar('\t');
            out.write(data, 0, 4);
            out.writeChar('\t');
            out.writeUTF(descs[i]);
        }
        out.close();

        // read it in again
        DataInputStream in = new DataInputStream(new FileInputStream(
                "Java2s.txt"));

        double price;
        int unit;
        String desc;
        double total = 0.0;
        byte[] outdata = new byte[4];

        try {
            while (true) {
                price = in.readDouble();
                in.readChar(); // throws out the tab
                unit = in.readInt();
                in.readChar(); // throws out the tab
                int r = in.read(outdata);
                in.readChar(); // throws out the tab
                desc = in.readUTF();
                
                System.out.println(price);
                System.out.println(unit);
                System.out.println(desc);
                for (int i=0; i<4; i++)
                {
                    System.out.println(" " + (byte)outdata[i]);
                }
                total = total + unit * price;
            }
        } catch (EOFException e) {}
        in.close();
    }
}