Catch a generic exception in Java?

Question

We use JUnit 3 at work and there is no ExpectedException annotation. I wanted to add a utility to our code to wrap this:

 try {
     someCode();         


        

Answer 1

@FunctionalInterface
 public interface ThrowingConsumer {
      void accept(T t) throws E;
 }

public static  Consumer errConsumerWrapper(ThrowingConsumer throwingConsumer,
                   Class exceptionClass, 
                   Consumer exceptionConsumer) {
            return i -> {
                try {
                    throwingConsumer.accept(i);
                } catch (Exception ex) {
                    try {
                        exceptionConsumer.accept(exceptionClass.cast(ex));
                    } catch (ClassCastException ccEx) {
                        throw new RuntimeException(ex);
                    }
                }
            };
        }

3. Usage example

   Stream.of("a").forEach(errConsumerWrapper(i -> Integer.parseInt(i), NumberFormatException.class, Throwable::printStackTrace));