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package ampelschaltung;
import java.util.Scanner; 

public class AmpelSchaltung 
{
    public static void main(String[] args) 
    {
        Ampel aS = new Ampel();
        while (true)
        {
            Scanner read = new Scanner (System.in);
            System.out.print("Eingabetaste drücken");
            read.nextLine();
            aS.schalte();
            System.out.println(aS.getFarbe());
        }
    }
}


class Ampel
{
    private String ampelFarbe="Test";
    private int i=0;
    private String [] arr = {"ROT","ROT-GELB","GRUEN","GELB"};
    
    public void schalte ()
    {
        ampelFarbe=arr[i];
        ++i;
        if (i==4) 
        {
            i=0;
        }
    }

    String getFarbe()
    {
        return ampelFarbe;
    }
}