Clear function of ArrayList

There is a problem with the following code ,list_RowData.clear() After calling ,list_Data The stored data in is also cleared .

List<ArrayList> list_Data = new ArrayList<ArrayList>();
ArrayList list_RowData = new ArrayList<>();
if(cursor_selectedTable.moveToFirst())
{
do{
for (int i = 2; i<cursor_selectedTable.getColumnCount();i++)
{
list_RowData.add(cursor_selectedTable.getString(i));
}
list_Data.add(list_RowData);
list_RowData.clear();
}while (cursor_selectedTable.moveToNext());
}

This explanation list_Data.add(list_RowData); Just quoted list_RowData The address of , Change it to ：

list_Data.add(new ArrayList(list_RowData));

Can solve the problem .