Thread: Can a null value be concatenated with an existing String? Exemple:

static public String populateVehicleDetails(Vehicle vehicle){
    String returnString = new String()
    String existingString = "Chevy Uplander "
    String nl = "\n"
 
    returnString.concat(existingString+nl).
        concat("Color: "+ vehicle.color + nl)
 
    return returnString
}

In the case that vehicle.color is null what will happens? A null pointer error?
null will be concatenated to the string in vehicle.color place? or will not concatenate anything in the place of vehicle.color
I'm asking that because I do not know if I have to check for null in each property of vehicle that I must concatenate (there are a lot of properties in the Vehicle object and some may not been set (they will return null).