Method Parameters and ArrayLists

Question

Alright so I am working on a small program in which I have a method which accesses an Arraylist.

So:

public void setGroups(int groupA, int groupB, ArrayList< String > groups)

then I have my Arraylist in the body of my main method:

ArrayList groupSets = new ArrayList< String >( Arrays.asList("group1", "group2" ));

So my question is, how do I call this code in my main method? My issue is with the arraylist part. Also these ints of groupA/B, I will be using these to pull elements out of the ArrayList.

So it would be like?:

playGame(0, 1, ArrayList< String > groupSets);

Except I know that the arraylist part is wrong and I am unsure if the ints are right or wrong as well, they seem right but I could be completely off. Please any help?!

Why not make that method return an Arraylist? Having a setter method with side effects seems to be a bad design — OneCricketeer
– OneCricketeer, Commented Jun 13, 2016 at 2:08

duffymo · Accepted Answer · 2016-06-13 02:06:14Z

1

Your declaration and call are different, so your question is a bit confusing.

The call should not include any type information:

setGroups(groupA, groupB, groups);

answered Jun 13, 2016 at 2:06

duffymo

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2 Comments

Smackelbap Over a year ago

Alright so when I format my call in this fashion: setGroups(0, 1, groups); it throws an error stating "non-static method setGroups(int, int, ArrayList<String>) cannot be referenced from a static context.

duffymo Over a year ago

Create an instance of the class that implements that method.

AJ_ · Accepted Answer · 2016-06-13 02:08:15Z

0

Its just

ArrayList<String> groupSets = new ArrayList<String>(); 
playGame(0, 1, groupSets);

answered Jun 13, 2016 at 2:08

AJ_

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Comments

Bradley D · Accepted Answer · 2016-06-13 03:18:35Z

0

In agreement with both of the partial answers above, let's see if we can make this comprehensive:

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class GroupStuff {

    public static void main(String[] args) {
        List<String> groupSets = new ArrayList<>(Arrays.asList("group1", "group2"));
        GroupStuff gs = new GroupStuff();
        gs.setGroups(0,1,groupSets);
    }

    public void setGroups(int groupA, int groupB, List<String> groups) {    
        //Do whatever you do here...
    }
}

And....

playGame(0, 1, ArrayList< String > groupSets);

should be

playGame(0, 1, groupSets);

edited Jun 13, 2016 at 3:18

answered Jun 13, 2016 at 2:23

Bradley D

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