import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class DataStream {

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

//        write("test5.txt");

//        read("test5.txt");

        readFromBuffer(writeToBuffer());

    }

    //write to local file

    public static void write(String path) throws IOException{

        DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(path)));

        out.writeInt(1);

        out.writeShort(2);

        out.writeLong(1);

        out.writeUTF("Some text");

        out.flush();

        out.close();

    }

    //read from local file

    public static void read(String path) throws IOException{

        DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(path)));

        System.out.println(in.readInt());

        System.out.println(in.readShort());

        System.out.println(in.readLong());

        System.out.println(in.readUTF());

        in.close();

    }

    //write to byte array

    public static byte[] writeToBuffer() throws IOException{

        byte[] buff = null;

        ByteArrayOutputStream bos = new ByteArrayOutputStream();

        DataOutputStream out = new DataOutputStream(new BufferedOutputStream(bos));

        out.writeInt(1);

        out.writeShort(2);

        out.writeLong(1);

        out.writeUTF("Some text");

        out.flush();

        out.close();

        buff = bos.toByteArray();

        bos.close();

        return buff;

    }

    //read from byte array

    public static void readFromBuffer(byte[] b) throws IOException{

        DataInputStream in = new DataInputStream(new BufferedInputStream(new ByteArrayInputStream(b)));

        System.out.println(in.readInt());

        System.out.println(in.readShort());

        System.out.println(in.readLong());

        System.out.println(in.readUTF());

        in.close();

    }

}