Question

I want overload two method with one parameter, in a method varargs of String and another String[] but I achieve following compilation-time error:

Duplicate method registerByName(String...)

My snippet code is:

public void registerByName(String[] names)
{

}

public void registerByName(String...names)
{

}

Why?

Answer 1

vararg is another way to place (Object[]) so a Method MyMethod(MyObject[] obj) and MyMethod(MyObject... obj) are the same to compiler. It’s just syntactic sugar.

You could refer the doc

It is still true that multiple arguments must be passed in an array, but the varargs feature automates and hides the process. Furthermore, it is upward compatible with preexisting APIs. So, for example, the MessageFormat.format method now has this declaration:

public static String format(String pattern,
                            Object... arguments);

The three periods after the final parameter’s type indicate that the final argument may be passed as an array or as a sequence of arguments. […]