Question

If I have two class constants:

List<String> workingList= new ArrayList<String>();
StringBuilder holder = new StringBuilder(50);

both residing within, call it class StringParser and primary method readStuff()…

public class StringParser{

public void readStuff(){ 

//parsing logic and adding <String> elements to 
//said workingList...

}//end of method readStuff

followed by a method where I inspect the contents of workingList…

public String someReaderMethod()
{ 
  int ind = 0;
  for(int i = 0; i < workingList.size();i++)
  {
    if(workingList.get(i).contains(someExp))
    {
      workingList.remove(ind);
      holder.append(workingList.get(i).toString());
}
else
{
   ++ind;
}
  }
   return holder.toString();    

}

…given that StringBuilder holder now contains what workingList has removed, is there a way I can ‘pass’ the contents of StringBuilder to a new ArrayList?

Answer 1

Is there a reason why you want to use a StringBuilder? You can directly insert the values into a new ArrayList. I think you could do it in a simpler way.

List<String> discardedList = new ArrayList<String>();

public void readStuff() {}

public static List<String> someReaderMethod()
{
  for(int i = 0; i < workingList.size(); i++)
  {
    if(workingList.get(i).contains(someExp))
    {
      discardedList.add(workingList.get(i));
      workingList.remove(i);
    }
  }
  return discardedList;
}