Adding a String into an ArrayList

Question

String [] Letters = {
    "a", ...... , "z",
};    

new ArrayList<String> (Arrays.asList(Letters));

Am currently using the above code, which I believe it creates an ArrayList from the Array call Letters(Please correct me if I'm wrong). I need to know how to add a new String into the ArrayList. Any help would be greatly appreciated, thank you.

MByD · Accepted Answer · 2012-04-23 09:06:45Z

2

Use add:

List<String> list = new ArrayList<String> (Arrays.asList(letters));
// Java naming convention - variables start with lower case ^^
list.add("some new string");

answered Apr 23, 2012 at 9:06

MByD

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4 Comments

Axelgria Over a year ago

thanks for your help. I'm just wondering, wouldn't the system be wasting memories on creating an extra list of array from letters[]? from what I know, new ArrayList<String> (Arrays.asList(Letters)); actually convert letter[] into and arrayList right? or am I wrong on that?

MByD Over a year ago

No, it initializes a new arraylist with the content of the array.

Axelgria Over a year ago

if ArrayList<String> (Arrays.asList(Letters)); is initiating a new arraylist what does List<String> list = new ArrayList<String> (Arrays.asList(letters)); do? it seems to me that it's initiating it again.

MByD Over a year ago

the same, only assigning the arraylist to a variable, so you can refer to it later, you can use ArrayList<String> list = new ArrayList<String> (Arrays.asList(letters));

Vaandu · Accepted Answer · 2012-04-23 09:07:28Z

1

You could use List.add method

List myList = new ArrayList<String> (Arrays.asList(Letters));
myList.add(myString);

answered Apr 23, 2012 at 9:07

Vaandu

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Comments

user370305 · Accepted Answer · 2012-04-23 09:07:49Z

1

Are you talking about,

String [] Letters = {
    "a", ...... , "z",
};    

ArrayList<String> arrayList = new ArrayList<String> (Arrays.asList(Letters));
arrayList.add("My String");

?

answered Apr 23, 2012 at 9:07

user370305

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