how to concatenate two arraylists in a third one

[nanees]

hey all ..
its my first time to work on netbeans and learning java .
i have two arraylists in my program and i want to add the first word in each arraylist in a third one sequentially

for example:
first arraylist second arraylist
one 1
two 2
three 3

i want the third one to be
one 1
two 2
three 3

[KevinWorkman]

Word to the wise- saying things like "i want a answer and waiting on ur solutions" will make people ignore your post, for several reasons. It makes you seem lazy, rude, and impatient.

With that in mind, check out the API for List.

[nanees]

thank you and sorry its my first time today to join this website :$

[ozzyman]

//declare list with Type (String)
List<String> myArrayList = new ArrayList<String>();

//get item by index
String firstItem = myArrayList.get(0);
String secondItem = myArrayList.get(1);
String NthItem = myArrayList.get(n-1);

//add items to list
String thirdItem = "Three";
List<String> mySecondList = new ArrayList<String>();
mySecondList.add(thirdItem);

[nanees]

thank you .. but im afraid i tried this method i get errors because im using two arraylists not one like in your example ... is there any concatenate method i could add items by it ?

[JosAH]

thank you .. but im afraid i tried this method i get errors because im using two arraylists not one like in your example ... is there any concatenate method i could add items by it ?

If one list is { a, b, c } and the second list is { d, e, f }, do you want the result to be { ad, be, cf }?

kind regards,

Jos

[ozzyman]

arrayList1.addAll(arrayList2)

always look at the API methods if you're not sure
ArrayList (Java 2 Platform SE v1.4.2))

[nanees]

yes thats exactly what i need

[ozzyman]

I think he meant to say that to JosAh, he needs it to be { ad, be, cf }

but there is no built-in method for that so he'd need a loop

[nanees]

yeah i want what Josah says ... to concatenate the two strings in a new arraylist ..
but im just new in java .. only working with it a couple of months so i don't know how to make it :$

btw ozzyman im a girl =]]

[BOJANM]

How to concatenate two arrays in Java? - Stack Overflow

[ozzyman]

my bad, she* :P

i can help you get started but you can't expect people to write all your code for you

what haven't you learnt that you can't do?

//add two strings together
String firstString = "a";
String secondString = "d";
String ad = firstString + secondString;

//loop through array list
for (int i=0; i<myArrayList.size(); i++) {

}

//retrieve element from list by index
myList.get(index);

you logic should be like this:

list 1 {a, b, c}
list 2 {d, e, f}

loop through list 1 {
    list 1.get(index) += list 2.get(index)
}

[nanees]

really thank you ..
your loop thats what i need
thanks again for your help =]]

[JosAH]

yes thats exactly what i need

So both Lists have to be the same size; here's a spoiler:

List<String> result= new ArrayList<String>();
for (int i= 0; i < a.size(); i++) // both a and b are your lists
   result.add(a.get(i)+b.get(i));

You fit that code snippet somewhere in your code.

kind regards,

Jos

[nanees]

Jos .. really thank you it worked =]]