import java.io.*;

public class Read {

	public static void main(String args[]) throws Exception {
		if (args.length != 1) {
			System.err.println("Usage: java Read <impl>");
			System.exit(1);
		}

		Class c = Class.forName(args[0]);
		Test t = (Test)c.newInstance();
		for (int i=0; i<5; i++) {
			t.test();
		}
		t.close();
	}
}

abstract class Test {

	protected InputStream pg_input;

	Test() throws IOException {
 		pg_input = new BufferedInputStream(new FileInputStream("/dev/zero"), 8192);
	}

	void close() throws IOException {
		pg_input.close();
	}

	void test() throws IOException {
		long start = System.currentTimeMillis();
		for (int i=0; i<100000000; i++) {
			ReceiveIntegerR(4);
		}
		long stop = System.currentTimeMillis();
		System.out.println(stop - start);
	}

	protected abstract int ReceiveIntegerR(int siz) throws IOException;
}


class Orig extends Test {

	Orig() throws IOException { }

	protected int ReceiveIntegerR(int siz) throws IOException
	{
		int n = 0;

       		for (int i = 0 ; i < siz ; i++)
		{
			int b = pg_input.read() & 0xFF;

			n = b | (n << 8);
		}

		switch (siz) {
			case 1:
				return (int)((byte)n);
			case 2:
				return (int)((short)n);
			default:
				return n;
		}
	}
}

class Two extends Test {

	Two() throws IOException { }

	protected int ReceiveIntegerR(int siz) throws IOException
	{
		int n = pg_input.read() & 0xFF;
		n = pg_input.read() | (n << 8);
		n = pg_input.read() | (n << 8);
		n = pg_input.read() | (n << 8);
		return n;
	}
}

class Three extends Test {

	private byte[] intbuf;

	Three() throws IOException {
		intbuf = new byte[4];
	}

	protected int ReceiveIntegerR(int siz) throws IOException
	{
		pg_input.read(intbuf);
        	return (intbuf[0] & 0xFF) << 24 | (intbuf[1] & 0xFF) << 16 | (intbuf[2] & 0xFF) << 8 | intbuf[3] & 0xFF;
	}
}