import java.nio.*;
import java.io.*;

public class DataInputOutputStreamTest {
  
  /* this method is only for debugging.
   * Comment out code, where method is called.
   */
  public static void print_array(byte[] array) {
    int i=0;
    for(byte b: array) {
      System.out.format("%x", b);
      if(++i % 2 == 0)
        System.out.print(" ");
    }
    System.out.println();
  }
  
  public static void main(String []args ) {
    File file = new File("file.bin");
    write(file);
    read(file);
  }
  
  public static void write(File file) {
    int a = -159954;
    double b = 125.128953;
    char c = 'Θ';
    String str = "Πώς είσαι;";
    
    try(DataOutputStream out = new DataOutputStream(new FileOutputStream(file))) {
      out.writeInt(a);
      out.writeDouble(b);
      out.writeChar(c);
      byte [] bytes_str = str.getBytes(java.nio.charset.StandardCharsets.UTF_16);
      out.write(bytes_str, 0, bytes_str.length);
    }
    catch(IOException ex) {
      System.out.println("Cannot write to file: "+file.getName());  
    }
  }
  
  public static void read(File file) {
    
    try(DataInputStream in = new DataInputStream(new FileInputStream(file))) {
      int a = in.readInt();
      double b = in.readDouble();
      char c = in.readChar();
      byte [] bytes = new byte[512];
      int str_size = in.read(bytes);
      
      System.out.println(a);
      System.out.println(b);
      System.out.println("'"+c+"'");
      System.out.println(new String(bytes, 0, str_size, java.nio.charset.StandardCharsets.UTF_16));
    }
    catch(IOException ex) {
       System.out.println("Something bad happened!"); 
    }
    
  }
}