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

I use an overloaded utility function called unchecked() which handles multiple use-cases.

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SOME EAMPLE USAGES

unchecked(() -> new File("hello.txt").createNewFile());

boolean fileWasCreated = unchecked(() -> new File("hello.txt").createNewFile());

myFiles.forEach(unchecked(file -> new File(file.path).createNewFile()));

SUPPORTING UTILITIES

public class UncheckedUtils {

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

    @FunctionalInterface
    public interface ThrowingSupplier {
        T get() throws Exception;
    }

    @FunctionalInterface
    public interface ThrowingRunnable {
        void run() throws Exception;
    }

    public static  Consumer unchecked(
            ThrowingConsumer throwingConsumer
    ) {
        return i -> {
            try {
                throwingConsumer.accept(i);
            } catch (Exception ex) {
                throw new RuntimeException(ex);
            }
        };
    }

    public static  T unchecked(
            ThrowingSupplier throwingSupplier
    ) {
        try {
            return throwingSupplier.get();
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }

    public static void unchecked(
            ThrowingRunnable throwing
    ) {
        try {
            throwing.run();
        } catch (Exception ex) {
            throw new RuntimeException(ex);
        }
    }
}