Question

class A contain:

public static ArrayList<String> sourceList = new ArrayList<String>();
// here ArrayList contain some string type data; 
public static ArrayList<String> getSource()
    {
        return sourceList;
    }

main class contain:

List<String> s1 = A.getSource();
for(String dk:s1) {
            System.out.println(dk);
        }

Here I am storing ArrayList data of class A into a list in class B and checking
whether its works or not.but when I run the main class it gives nothing.

thanks.

Answer 1

I’ve simulated what you are doing, and it’s working as expected. Are you sure the list is being populated correctly?

import java.util.ArrayList;
import java.util.List;

public class PrintList {


    public static void main(String[] args) {


        List<String> s1 = AClass.getSource();

        for (String dk : s1) {
            System.out.println("We have : " + dk);
        }
    }
}

class AClass {
    public static final ArrayList<String> sourceList = new ArrayList<String>();

    static {
        sourceList.add("A string");
        sourceList.add("Another string");        
    }

    public static ArrayList<String> getSource() {
        return sourceList;
    }
}