Playing around with muting exception in Java 8

Helpers.java

public class Helpers {

    public static <T> T getWithRTE(ExceptionSupplier<T> exceptionThrower) {
        try {
            return exceptionThrower.get();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        //int num = ThrowingSupplier.unchecked(Helpers::readIntFromFile).get();

        int num = getWithRTE(() -> readIntFromFile());

        num = getWithRTE(Helpers::readIntFromFile);
    }

    private static Integer readIntFromFile() throws Exception {
        return 4;
    }

    private static Integer launchMissiles() throws Exception {
        return 5;
    }

    private static Integer narrowerException() throws ArithmeticException {
        return 6;
    }

    @FunctionalInterface
    public interface ExceptionSupplier<T> {

        T get() throws Exception;
    }

    public static void other_main(String[] args) {
        ExceptionSupplier<Integer> supplier = () -> launchMissiles();
        System.out.println(getWithRTE(supplier));
        System.out.println(getWithRTE(() -> narrowerException()));

    }
}