Question

I have a interface and in the interface I want to declare a method such that it can take any number of objects as input.

Something like this:

interface Implementable{
     public ReturnObj doIt(objects ....);
}

Please advise

Answer 1

The correct syntax would in your case be:

interface Implementable{
    public ReturnObj doIt(Object... objs);
}

Official documentation for var-arg methods is found here.

I was about to ask the difference between varargs and passing an array,

Varargs gets compiled into an argument of an array-type. The only difference is with the vararg syntax, method calls such as

doIt("hello", "world");

will be compiled into

doIt(new Object[] { "hello", "world" });

In other words, given a declaration such as

public ReturnObj doIt(Object[] objs);

you’ll have

doIt(new Object[] { "hello", "world" });  // works fine
doIt("hello", "world");                   // won't compile

while given the var-arg declaration, both method calls will compile and be equivalent.