CODEWITHSUNDEEP
java
Dylan Czenski
Dylan Czenski

Reputation: 1375

Adding multiple elements to String[]

In my main method I have the command below:

if (args.length == 0) // if no command line argument is given
    args.addAll(Arrays.asList("Hello","world"); // error

And there's an error says:

Cannot invoke addAll() on the array type String[]

How do I add multiple elements to args?

Upvotes: 0

Views: 655

Answers (2)

Elcan
Elcan

Reputation: 834

The function you're trying to invoke is used by the List objects, not arrays. If you want to work with List, which is easier to use when it comes to add data, try :

List<String> list = new ArrayList<String>(Arrays.asList(args));
list.addAll(Arrays.asList("Hello","world"));

This method will happen them no matter what. if you only want to append them if ags is empty, then use

if (args.length == 0) // if no command line argument is given
{
    List<String> list = new ArrayList<String>(Arrays.asList(args));
    list.addAll(Arrays.asList("Hello","world"));
}

Upvotes: 1

MikeCAT
MikeCAT

Reputation: 75062

I guess you cannot do such a thing. To append elements to array (not ArrayList or other Collections), create new array and copy elements in old array and elements to append.

In this case, you can simply assign new array with default elements like this:

if (args.length == 0) // if no command line argument is given
    args = new String[]{"Hello","world"};

Upvotes: 4

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