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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.

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3 Answers

up vote 2 down vote accepted

Use add:

List<String> list = new ArrayList<String> (Arrays.asList(letters));
// Java naming convention - variables start with lower case ^^
list.add("some new string");
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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? – edtylerpro Apr 23 at 9:18
1  
No, it initializes a new arraylist with the content of the array. – Binyamin Sharet Apr 23 at 9:19
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. – edtylerpro Apr 23 at 9:23
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)); – Binyamin Sharet Apr 23 at 9:24
=D I see. thanks for your help and explanation! – edtylerpro Apr 23 at 9:27
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up vote 1 down vote

You could use List.add method

List myList = new ArrayList<String> (Arrays.asList(Letters));
myList.add(myString);
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thanks for helping – edtylerpro Apr 23 at 9:24
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up vote 1 down vote

Are you talking about,

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

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

?

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thank you for your help. – edtylerpro Apr 23 at 9:19
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