David questions

• What is the difference between {{}} and [[]] in the template data binding in Polymer?
• how to keep <br/> tags when using Dom in php to parse html document?
• Is there a resource leak here?
• I cannot acess to the website host on Amazon EC2 instance even I think the configuration is right
• is java AtomicReference thread safe when used within parallelStream?
• how to change the ImageButton's image when it is pressed and released?
• How to detect array equality in JavaScript?
• How to hide the horizontal line at the bottom of each item in android listview? [duplicate]
• How to get the date from the DatePicker widget in Android?
• How to get the row count of a query in Android using SQLite?

David answers