Question

This is a code to store data of a particular column in database to an array list.

ArrayList<String> mArrayList = new ArrayList<String>();
        Cursor mCursor = null;
        mCursor.moveToFirst();
        while(!mCursor.isAfterLast()) {
             mArrayList.add(mCursor.getString(mCursor.getColumnIndex(DBAdapter.SOURCE_NODE_ID)));
             mCursor.moveToNext();
        }

for(String d1:mArrayList) {
                    System.out.println(d1);}

but after running the program nothing gives in the output.

what is wrong in this program ?

thanks.

Answer 1

It will through null pointer exception:

Cursor mCursor = null;
mCursor.moveToFirst();