Save and read various data type value using DataOutputStream and DataInputStream - Java File Path IO

Java examples for File Path IO:Binary File

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Description

Save and read various data type value using DataOutputStream and DataInputStream

Demo Code

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

public class DataStreams {
    static final String dataFile = "invoicedata";

    static final double[] prices = { 19.99, 9.99, 15.99, 3.99, 4.99 };
    static final int[] units = { 12, 8, 13, 29, 50 };
    static final String[] descs = { "Java T-shirt", "Java Mug",
            "Duke Juggling Dolls", "Java Pin", "Java Key Chain" };

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

        DataOutputStream out = null;

        try {//from   w  w w  .  jav a2 s. co  m
            out = new DataOutputStream(new BufferedOutputStream(
                    new FileOutputStream(dataFile)));

            for (int i = 0; i < prices.length; i++) {
                out.writeDouble(prices[i]);
                out.writeInt(units[i]);
                out.writeUTF(descs[i]);
            }
        } finally {
            out.close();
        }

        DataInputStream in = null;
        double total = 0.0;
        try {
            in = new DataInputStream(new BufferedInputStream(
                    new FileInputStream(dataFile)));

            double price;
            int unit;
            String desc;

            try {
                while (true) {
                    price = in.readDouble();
                    unit = in.readInt();
                    desc = in.readUTF();
                    System.out.format(
                            "You ordered %d units of %s at $%.2f%n", unit,
                            desc, price);
                    total += unit * price;
                }
            } catch (EOFException e) {
            }
            System.out.format("For a TOTAL of: $%.2f%n", total);
        } finally {
            in.close();
        }
    }
}

/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

Result


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