// demonstrate I/O binary operations on files

import java.io.*;

class ReadWriteData {

public static void main(String[] args) {

int i = 10;

double d = 1023.56;

boolean b = true;

// try to write some binary data

try (DataOutputStream aFileOut =

new DataOutputStream(new FileOutputStream("test_binary_data")))

{

System.out.printf("Writing %d to file.\n", i);

aFileOut.writeInt(i);

System.out.printf("Writing %.2f to file.\n", d);

aFileOut.writeDouble(d);

System.out.println("Writing " + b + " to file.");

aFileOut.writeBoolean(b);

} catch (IOException aExc) {

System.out.println("Cannot write file due to exception: " + aExc);

return;

}

// try to read some binary data

try (DataInputStream aFileIn =

new DataInputStream(new FileInputStream("test_binary_data")))

{

System.out.println("Reading i from file: " + aFileIn.readInt());

System.out.println("Reading d from file: " + aFileIn.readDouble());

System.out.println("Reading b from file: " + aFileIn.readBoolean());

} catch (IOException aExc) {

System.out.println("Cannot read file due to exception: " + aExc);

}

// TODO: figure out how DataInputStream recognizes binary data in sequence

}

}