How to create multiple arraylist with dynamic data in java

Question

I am newbie in Java.please don't put -ve vote. I just want to know. I have following data:

[john-london-4455-null,mark-newyork-null-null,abishek-null-2244-java developer...may be more]

may be more these data dynamic which get from web.

Now I want create in this case, three array list.It is depend upon the data getting from web.

Edit:

My intention is, I want to create

array1= john, mark, abishek
array2= london, newyork,null
array3=4455,null,2244
array4=null,null, java developer
.
.
.

may be more depend upon data.

I didn't understand your question. If you give more details I'll tell you the perfect solution. — Nagaraju
– Nagaraju, Commented Feb 11, 2014 at 4:08
Can you please tell in which format you are getting response from server ? — Kunu
– Kunu, Commented Feb 11, 2014 at 4:44
I am getting data like this- [john-london-4455-null,mark-newyork-null-null,abishek-null-2244-java developer]. — No_Name_Code
– No_Name_Code, Commented Feb 11, 2014 at 4:53
So are you getting john-london-4455-null as a single String ? What's your main problem, Extracting value from the String or adding in Array ? — Kunu
– Kunu, Commented Feb 11, 2014 at 5:09

Phil · Accepted Answer · 2014-02-11 04:52:55Z

1

It looks like your data is some sort of Array of Objects with text separated by hyphens. You can parse this into lists using the following code:

String data = "[[john-london-4455-null],[mark-newyork-null-null],[abishek-null-2244-java developer]]";

//first, remove the first and last square brackets
data = data.substring(1, data.length()-1);
//now separate each object by splitting on the commas
String[] parts = data.split(",");

//create the array that will store all your array data
String[][] lists = new String[parts.length][];

//now create each list and store it in your array
for (int i = 0; i < parts.length; i++) {
    String str = parts[i].substring(1, parts[i].length()-1);
    lists[i] = str.split("-");
}

Now you have the lists object to work with. This is more efficient than using List<String> too.

answered Feb 11, 2014 at 4:52

Phil

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2 Comments

No_Name_Code Over a year ago

I have above data in arraylist not string. This data in arraylist->>[john-london-4455-null,mark-newyork-null-null,abishek-null-2244-java developer]. So how to split these.

No_Name_Code Over a year ago

Thank you Phil, It is very closer of my problem.

Kunu · Accepted Answer · 2014-02-11 04:11:22Z

1

Why don't you create an Utility class like

public class PersonInfo{

  String name;
  String loc;
  String add;
}

And create an ArrayList<PersonInfo> In this case you don't have to create separate ArrayList

answered Feb 11, 2014 at 4:11

Kunu

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Comments

technocrat · Accepted Answer · 2014-02-11 09:27:58Z

Below is the code snippet I have written as per my understanding of your problem. I tried to split the ArrayList data into array. Then using simple for loops insert the split data into respective lists.

  String[] listToArray;
        List<String> one  = new ArrayList<>();
        List<String> two  = new ArrayList<>();

        List<String> l = new ArrayList<>();
        l.add("1-name1-addr1");
        l.add("2-name2-addr2");

// l contains the data as you mentioned 

for (Iterator<String> iterator = l.iterator(); iterator.hasNext();) {
            String string = (String) iterator.next();


    listToArray = string.split("-");

            for(int i =0; i<listToArray.length; i+=3){
                one.add(listToArray[i]);
            }

            for(int i =1; i<listToArray.length; i+=3){
                two.add(listToArray[i]);
            }

        }

        System.out.println(one);
        System.out.println(two);
    }

If you needed the output as an array just call toArray() method on individual lists.

PS: Things would become more easier if you can opt for beans as suggest by few here.

Guillaume Jacquenot · Accepted Answer · 2016-12-14 06:08:37Z

1

create PersonInfo Bean class

class PersonInfo
{
    String name,loc,add;
    Data(String name,String loc,String add)
    {
        this.name=name;
        this.loc=loc;
        this.add=add;
    }
}

And create an ArrayList<PersonInfo>

List<PersonInfo> list = new ArrayList<PersonInfo>();
list.add(new PersonInfo("john", "london", "4455"));
list.add(new PersonInfo("abishek", "mumbai", "2244"));
list.add(new PersonInfo("mark", "newyork", "3366"));

edited Dec 14, 2016 at 6:08

Guillaume Jacquenot

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answered Feb 11, 2014 at 4:10

Kanaiya Katarmal

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