将StringBuilder内容“传输”到Java中的新ArrayList

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

You will need a deliminator to parse string and then you can use Split method and convert String[] to ArrayList.

holder.append(tempList.get(i));
holder.append(";");//Deliminator

Now when you have to use it you need to do

String[] strings =holderString.split(";");
List<String> list = Arrays.asList(strings);

Answer 2

While appending your List elements to your StringBuilder object, you need to append an extra delimiter after every append..

Later on, you can split the String in StringBuilder on that delimiter, and then convert your String array thus obtained to an ArrayList ..

Answer 3

Is there a reason why u 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;
}