RPI3 LED

import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.GpioPin;
import com.pi4j.io.gpio.Pin;
import com.pi4j.io.gpio.PinState;
import com.pi4j.io.gpio.RaspiPin;

public class Led
{
    // instance variables - replace the example below with your own
    private GpioPinDigitalOutput pin;

    /**
     * Constructor for objects of class Led
     */
    public Led(Pin pinId)
    {
        
        if(pinId == null){
            pinId = RaspiPin.GPIO_01;
        }
        
        GpioController gpio = GpioFactory.getInstance();
        try{        // create gpio controller

               pin = gpio.provisionDigitalOutputPin(pinId);
            
        } catch(Exception e){ 

            // sollte er noch offen sein schliess mal alles und versuche es nochmal
            gpio.shutdown();
            gpio.unprovisionPin(gpio.getProvisionedPins().toArray(new GpioPin[]{}));
            gpio = GpioFactory.getInstance();
            
            pin = gpio.provisionDigitalOutputPin(pinId);
            
        }

    }
    
    void on(){
         pin.high();
    }

    void off(){
         pin.low();
    }

    
    void toggle(){
        if(pin.isHigh()){
            pin.low();
        }else {
            pin.high();
        }
    }
    
    public void close(){
        GpioController gpio = GpioFactory.getInstance();
        gpio.unprovisionPin(gpio.getProvisionedPins().toArray(new GpioPin[]{pin}));
    }
}