Switch Case

switch (state){  
    case RED -> state = AmpelState.GREEN;  
    case GREEN -> state = AmpelState.RED;   
    default -> state = AmpelState.RED;  
}

oder

switch (state){  
    case RED -> {
	    state = AmpelState.GREEN;
	}  
    case GREEN -> {
	    state = AmpelState.RED;
	}   
    default -> {
	    state = AmpelState.RED;
	}  
}