Pawan questions

• Why is programming to abstract classes instead of interfaces wrong? [closed]
• How to hide other div's except the required one?
• How to get desired format from ArrayList
• How to pass dynamic value to a JSON String
• Why was the explain query output giving me BasicCursor eventhough the collection had indexes on it?
• How can a Thread constructor can accept a run method directly?
• Why isn't the String value changed after String.Replace in Java? [duplicate]
• Sort the hashset based on date
• How to Split the String by symbol name and Date in this case
• How to remove null keys from JSON Object

Pawan answers