Java 8 Lambda function that throws exception? -

i know how create reference method has string parameter , returns int, it's:

function<string, integer> 

however, doesn't work if function throws exception, it's defined as:

integer mymethod(string s) throws ioexception 

how define reference?

you'll need 1 of following.

• if it's code, define own functional interface declares checked exception

  @functionalinterface public interface checkedfunction<t, r> {    r apply(t t) throws ioexception; } 

  and use it

  void foo (checkedfunction f) { ... } 

• otherwise, wrap integer mymethod(string s) in method doesn't declare checked exception:

  public integer mywrappedmethod(string s) {     try {         return mymethod(s);     }     catch(ioexception e) {         throw new uncheckedioexception(e);     } } 

  and then

  function<string, integer> f = (string t) -> mywrappedmethod(t); 

  or

  function<string, integer> f =     (string t) -> {         try {            return mymethod(t);         }         catch(ioexception e) {             throw new uncheckedioexception(e);         }     };