LogicGates/eu.heili/LogicGate.java

import java.util.ArrayList;
import java.util.Arrays;

public abstract class LogicGate {
    private final ArrayList<DigitalInput> inputs = new ArrayList<>();

    /**
     * validate gate output.
     * @return validated output
     */
    public abstract boolean getOutput();

    public LogicGate(int inputnr) {
        for (int i = 0; i < inputnr; i++) {
            inputs.add(new DigitalInput()); // generate new objects for new inputs
        }
    }

    public LogicGate(boolean... inputvals) {
        for (boolean i:inputvals) {
            inputs.add(new DigitalInput(i));
        }
    }

    public DigitalInput getInput(int nr) {
        if (nr >= getInputNumber())
            throw (new InputOutOfBoundsException());
        return inputs.get(nr);
    }

    public int getInputNumber() {
        return inputs.size();
    }
}