Why there are so many assertAll methods in Junit class AssertAll? What is the use of each.

class AssertAll {

private AssertAll() {
/* no-op */
}

static void assertAll(Executable… executables) {
assertAll(null, executables);
}

static void assertAll(String heading, Executable… executables) {
Preconditions.notEmpty(executables, “executables array must not be null or empty”);
Preconditions.containsNoNullElements(executables, “individual executables must not be null”);
assertAll(heading, Arrays.stream(executables));
}

static void assertAll(Collection<Executable> executables) {
assertAll(null, executables);
}

static void assertAll(String heading, Collection<Executable> executables) {
Preconditions.notNull(executables, “executables collection must not be null”);
Preconditions.containsNoNullElements(executables, “individual executables must not be null”);
assertAll(heading, executables.stream());
}

static void assertAll(Stream<Executable> executables) {
assertAll(null, executables);
}

static void assertAll(String heading, Stream<Executable> executables) {
Preconditions.notNull(executables, “executables stream must not be null”);

List<Throwable> failures = executables //
.map(executable -> {
Preconditions.notNull(executable, “individual executables must not be null”);
try {
executable.execute();
return null;
}
catch (Throwable t) {
UnrecoverableExceptions.rethrowIfUnrecoverable(t);
return t;
}
}) //
.filter(Objects::nonNull) //
.collect(Collectors.toList());

if (!failures.isEmpty()) {
MultipleFailuresError multipleFailuresError = new MultipleFailuresError(heading, failures);
failures.forEach(multipleFailuresError::addSuppressed);
throw multipleFailuresError;
}
}

}