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up vote 0 down vote favorite

In my application I am storing string type data in arraylist with "|" operator as separator. i.e my array-list contains data like [|123,124,|,324,543|789,649,666,356] Now I need to split the arraylist with "|" and need to store the data into a string array. How can I do that?

My Code:

ArrayList<String> arr2;
ArrayList<ArrayList<String>> alllist;
    String[] str;
for (j = 0; j < alllist.size(); j++) {

      arr2 = new ArrayList<String>();
     arr2 = alllist.get(j);
         for (Object v : arr2) {
         str = v.toString().split("|");
         System.out.println("checking str[i]"+str[i]);
         if (str[j].contains(",")) {
                System.out.println("hii");
         } 
        }

It is showing error at if(str[j].contains(",")) line....Please help me regarding this.. thanks in advance...

share|improve this question
1  
What type does the str variable have? AFAIK, the split() method returns an array of Strings, but the String class does not have the contains() method. –  Egor Mar 19 '12 at 13:53
    
What is the error? –  hmjd Mar 19 '12 at 13:53
    
the error is null pointer exception –  RaagaSudha Mar 19 '12 at 13:54
1  
Where do you set i ? –  hmjd Mar 19 '12 at 13:55
    
Can you post code that is compilable, puts some sample data in your ArrayList, and let us know what output you expect so that we better understand what you are trying to achieve? –  assylias Mar 19 '12 at 14:04

2 Answers 2

up vote 0 down vote

Not sure what you want to achieve, but this could help you to build your code:

public static void main(String args[]) throws ParseException {

    List<List<String>> allList = new ArrayList<List<String>>();
    allList.add(Arrays.asList("|123,124,|,324,543|789,649,666,356"));

    for (List<String> list : allList) { //use a for each loop instead of looping on an int and using allList.get(i)
        for (String s : list) { //Same thing
            String[] str = s.split("\\|"); //You need to escape | with \\ to get the expected split
            for (String item : str) {
                System.out.println("checking " + item);
                if (item.contains(",")) {
                    System.out.println("hii");
                }
            }

        }
    }
}
share|improve this answer
up vote 0 down vote

Why Don't you simply use this :

List<String> flag2=new ArrayList<String>();
String flag[]=new String[flag2.size()];

for(int i=0;i<flag2.size();i++){
    flag[i]=flag2.get(i);
}
share|improve this answer

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