import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class FileArray
{
	public static void writeArray()
	{
		String fileName = "file.bin";
		int[] array = {10, 20, 30};

		try
		{
			FileOutputStream fileOs = new FileOutputStream(fileName);
			ObjectOutputStream os = new ObjectOutputStream(fileOs);

			for (int i = 0; i < 3; i++)
				os.writeInt(array[i]);

			os.close();
			fileOs.close();
		}
		catch (FileNotFoundException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		catch (IOException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	public void readArray()
	{
		String fileName = "file.bin";
		int[] array1;

		try
		{
			FileInputStream fileIs = new FileInputStream(fileName);
			ObjectInputStream is = new ObjectInputStream(fileIs);

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

			is.close();
			fileIs.close();

		}
		catch (FileNotFoundException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		catch (IOException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}