JAVA EE: Java Tutorial : Java IO (DataOutputStream)

Thursday 22 September 2016

Java Tutorial : Java IO (DataOutputStream)

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https://www.youtube.com/watch?v=INIpdcB6o0k&list=UUhwKlOVR041tngjerWxVccw

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Java Tutorial : Java IO (DataOutputStream)

DataOutputStreamDemo.java

import java.io.DataOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class DataOutputStreamDemo
{

    public static void main(String[] args) throws Exception
    {
        DataOutputStreamDemo dataOutputStreamDemo = new DataOutputStreamDemo();
        dataOutputStreamDemo.writePrimitiveData();
    }

    public void writePrimitiveData() throws IOException
    {
        DataOutputStream dataOutputStream = null;
        FileOutputStream fileOutputStream = null;
        try
        {
            fileOutputStream = new FileOutputStream("data.bin");
            dataOutputStream = new DataOutputStream(fileOutputStream);

            dataOutputStream.writeInt(125);
            dataOutputStream.writeFloat(150.45F);
            dataOutputStream.writeLong(9090);
            dataOutputStream.writeBoolean(true);

            System.out.println("Successfully written primitive data's to \'data.bin\' file\n");
        }
        finally
        {
            if (dataOutputStream != null)
            {
                /*
                 * Closing a DataOutputStream will also
                 * close the OutputStream instance to which
                 * the DataOutputStream is writing.
                 */
                dataOutputStream.close();
            }
        }

    }
}

Output

Successfully written primitive data's to 'data.bin' file

data.bin

DataInputStreamDemo.java

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;

public class DataInputStreamDemo
{

    public static void main(String[] args) throws Exception
    {
        DataInputStreamDemo dataInputStreamDemo = new DataInputStreamDemo();
        dataInputStreamDemo.readPrimitiveData();
    }

    public void readPrimitiveData() throws IOException
    {
        FileInputStream fileInputStream = null;
        DataInputStream dataInputStream = null;

        try
        {
            fileInputStream = new FileInputStream("data.bin");
            dataInputStream = new DataInputStream(fileInputStream);

            int intValue = dataInputStream.readInt();
            float floatValue = dataInputStream.readFloat();
            long longValue = dataInputStream.readLong();
            boolean booleanValue = dataInputStream.readBoolean();

            System.out.println("intValue     = " + intValue);
            System.out.println("floatValue   = " + floatValue);
            System.out.println("longValue    = " + longValue);
            System.out.println("booleanValue = " + booleanValue);
        }
        finally
        {
            if (dataInputStream != null)
            {
                /*
                 * Closing a DataInputStream will also close
                 * the InputStream instance from which the
                 * DataInputStream is reading.
                 */
                dataInputStream.close();
            }
        }

    }

}
Output
intValue     = 125
floatValue   = 150.45
longValue    = 9090
booleanValue = true