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up vote 0 down vote favorite
1

I have 

String add_data[] = new String[6];

with datas at 0,1,2,3,4,5 indexes.

Also I have 

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

now I need to put the values in all the indexes in add_data at data[0].

How can i do this? please guide me.

Eg. add_data[0]="a"; add_data[0]="b";

data[0] should have "ab"
share|improve this question
    
that's messed up! –  Bala R Mar 6 '11 at 13:15
3  
Even after reading the answers I don't understand the question. Do you have an array and want to fill its elements into an ArrayList? Or the other way around? –  Paŭlo Ebermann Mar 6 '11 at 17:25

4 Answers 4

up vote 1 down vote

use Arrays.asList(array) method to copy array to List. In your case - String[] to List<String>.

share|improve this answer
    
I don't think so it's answer for this question –  smas Mar 6 '11 at 13:40
    
@smas Question is little bit unclear bu as I understand it OP wants to copy array to list. –  michal.kreuzman Mar 6 '11 at 19:26
    
for me: he wants catenate all add_data elements and put into data (ArrayList) at 0 index –  smas Mar 6 '11 at 19:48
up vote 0 down vote 
String result = "";
for (int i = 0; i < add_data.length: i++) {
  result += add_data[i];
}
data.add(result);
share|improve this answer
up vote 0 down vote

I'm not sure to understand what you want to do, but try this :

String temp = "";
for(String s : add_data) {
    temp += s;
}
data.put(temp);
share|improve this answer
    
Your syntax is wrong for the for loop, you just want for not foreach. Also wouldn't a StringBuilder be better than concatenation in a loop? –  Richard Miskin Mar 6 '11 at 20:06
    
Too much PHP lately ^^ For the Stringbuilder, it's been a while since I saw a benchmark, but I don't remember a performance difference in these kind of situation. –  krtek Mar 6 '11 at 21:58
up vote -1 down vote

You need:

  1. Catenate all Strings from your array
  2. Put this at 0 index in your ArrayList

Something like this:

String addData[] = new String[6];
ArrayList<String> data = new ArrayList<String>();    
addData[0] = "a";
addData[1] = "b";

// 1. catenate all strings
String str = "";
for (String s : addData) {
    str += (s != null)?s:"";
}

// 2. put it into 0 index in your arraylist     
data.add(0, str);
System.out.println(data.get(0));
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