Java 8 Lambda function that throws exception?

Question

I know how to create a reference to a method that has a String parameter and returns an int, it\'s:

Function         


        

Answer 1

By default, Java 8 Function does not allow to throw exception and as suggested in multiple answers there are many ways to achieve it, one way is:

@FunctionalInterface
public interface FunctionWithException {
    R apply(T t) throws E;
}

Define as:

private FunctionWithException myMethod = (str) -> {
    if ("abc".equals(str)) {
        throw new IOException();
    }
  return 1;
};

And add throws or try/catch the same exception in caller method.