Create array of string from an Arraylist

Question

I want to get :

String[] phoneNos= {"07064267499","07064267499","07064267499"};

from :

ArrayList<Object> phoneNos = [0803406914, 08167337499, 0803377973] ;

This is my code snippet :

public ArrayList < Object > getPhoneNo() {
    ArrayList < Object > phoneNos = new ArrayList < Object > ();
    try {
        Statement stmt = con.createStatement();
        ResultSet result = stmt.executeQuery("SELECT Phone_No FROM paient_details");
        while (result.next()) {
            phoneNos.add(result.getString(1));
        }
    } catch (SQLException e) {
        System.out.println(e.getMessage());
    }

    return phoneNos;
}

Maybe you can take a look at Guava's transform list, as explained here: stackoverflow.com/questions/7383624/… — facundofarias
– facundofarias, Commented Oct 25, 2015 at 11:17

Yassin Hajaj · Accepted Answer · 2015-10-25 11:18:26Z

2

You can use the toArray() method from your List object :

String[] phoneNosArray = new String[phoneNos.size()];
phoneNosArray = phoneNos.toArray(phoneNosArray);

answered Oct 25, 2015 at 11:18

Yassin Hajaj

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Comments

Eran · Accepted Answer · 2015-10-25 11:17:03Z

1

First of all, change your ArrayList to :

ArrayList<String> phoneNos = new ArrayList<String>();

since you store Strings in it.

Then you can get the corresponding array with :

String[] arr = phoneNos.toArray(new String[phoneNos.size()]);

answered Oct 25, 2015 at 11:17

Eran

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5 Comments

Eran Over a year ago

@awomtm What do you mean by that? What null was returned? Where?

awomtm Over a year ago

return arr; gives null. I am a java newbie anyway.

Eran Over a year ago

@awomtm Can you show the actual code giving the error?

awomtm Over a year ago

Add comment says my code is too long. Pls is there any other way to repost my code

Eran Over a year ago

@awomtm You can edit your question and post it there.

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