How String[] args different from String... args in the main method?

Question

I got confused when I saw these two techniques through which we can pass our command line argument in main method.

I have seen this link in stackoverflow but still I don't get it.

My doubt is which is efficient between these two ways.

1.In first we are calling main and assigning parameter as a string array 2.In second we are calling main with variable no of arguments.

A String... is syntactic sugar. It's actually wrapped in an String[] when it's passed into the method. — Boris the Spider
– Boris the Spider, Commented Mar 3, 2014 at 0:42
docs.oracle.com/javase/1.5.0/docs/guide/language/varargs.html — Sinkingpoint
– Sinkingpoint, Commented Mar 3, 2014 at 0:42

Eric · Accepted Answer · 2014-03-03 00:43:03Z

4

It means that if you want to invoke the main method of a class that isn't the entry point, it's easier:

class MyProgram1 {
    public static void main(String[] args) {
        MyProgram2.main(new String[] {"arg1", "arg2", "arg3"})
    }
}

vs:

class MyProgram1 {
    public static void main(String[] args) {
        MyProgram2.main("arg1", "arg2", "arg3")
    }
}

answered Mar 3, 2014 at 0:43

Eric

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2 Comments

Satya Over a year ago

Dear @Eric Which is efficient and when we use String... args[]??

Eric Over a year ago

@Satya: It's your main method. It's called once. You do not care about the efficiency of that invocation. You use String... args[] when you want the error legacy array notation not allowed on variable-arity parameter. You use String[]... args when you want to pass a variable number of string arrays.

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