I have an assignment where it says
The parameters must be checked to ensure they are not null or empty nor a negative value.
I am having trouble understanding what checking to ensure they are not null or empty nor negative means.
//My constructor:
`public A0_Realtor(String listingNumberParam)
{
setListingNumber(listingNumberParam);
}
Setter that compiles but doesn’t work? if a create a default constructor and check the value, I find that the value is null and doesn’t print out invalid value
//Getter not sure if this does anything
enter code herepublic String getListingNumber(){
return listingNumber;
}
//Setter
`public void setListingNumber(String newListingNumber){
if( newListingNumber != null && newListingNumber.isEmpty()){
System.out.println("Invalid value");
} else {
listingNumber = newListingNumber;
`public void setListingNumber(String newListingNumber){
if( newListingNumber != null && newListingNumber.isEmpty()){
System.out.println("Invalid value");
} else {
listingNumber = newListingNumber;
}
//something that prints asking price. I suspect I am just getting null because of the”void” i typted?
`public void printDetails (){
System.out.println(“MLS Number: “+ listingNumber);
}
My output :
MLS Number: null
?????????????????????????????????????????????????????????????????????????????????????????
