What is the standard exception to throw in Java for not supported/implemented operations?
JavaJava Problem Overview
In particular, is there a standard Exception subclass used in these circumstances?
Java Solutions
Solution 1 - Java
java.lang.UnsupportedOperationException
> Thrown to indicate that the requested operation is not supported.
Solution 2 - Java
Differentiate between the two cases you named:
-
To indicate that the requested operation is not supported and most likely never will, throw an
UnsupportedOperationException. -
To indicate the requested operation has not been implemented yet, choose between this:
-
Use the
NotImplementedExceptionfrom apache commons-lang which was available in commons-lang2 and has been re-added to commons-lang3 in version 3.2. -
Implement your own
NotImplementedException. -
Throw an
UnsupportedOperationExceptionwith a message like "Not implemented, yet".
Solution 3 - Java
If you create a new (not yet implemented) function in NetBeans, then it generates a method body with the following statement:
throw new java.lang.UnsupportedOperationException("Not supported yet.");
Therefore, I recommend to use the UnsupportedOperationException.
Solution 4 - Java
If you want more granularity and better description, you could use NotImplementedException from commons-lang
Warning: Available before versions 2.6 and after versions 3.2 only.
Solution 5 - Java
The below Calculator sample class shows the difference
public class Calculator() {
int add(int a , int b){
return a+b;
}
int dived(int a , int b){
if ( b == 0 ) {
throw new UnsupportedOperationException("I can not dived by zero,
not now not for the rest of my life!")
}else{
return a/b;
}
}
int multiple(int a , int b){
//NotImplementedException from apache or some custom excpetion
throw new NotImplementedException("Will be implement in release 3.5");
}
}