How To Prevent Java From Creating Object

I just want to ask about a kind inheritance.Let say I have an interface MachineCode.I also have different classes, Binary, Hex and Octal that implements MachineCode

Question: How can I prevent java to create an Object like this:

Binary bin = new Binary();
Hex hex = new Hex();
Octal octal = new Octal();

those declaration above must be compile error,

I want to create Objects of Binary, Hex, and Octal this way:
MachineCode bin = new Binary();
MachineCode hex = new Hex();
MachineCode octal = new Octal();