LogicGates/eu.heili/NandGate.java

public class NandGate extends AndGate {
    public NandGate(final int inputnr) {
        super(inputnr);
    }

    public NandGate(final DigitalInput... inputvals) {
        super(inputvals);
    }

    @Override
    public boolean getOutput() {
        return !super.getOutput();
    }
}