Understanding Null, Empty List, and Empty Array in Java
As a programmer, it’s essential to differentiate between null, empty lists, and empty arrays when working in Java. Here’s a quick breakdown from my experience:
- Null: It means the reference points to nothing. Accessing it will lead to a NullPointerException. - Empty List: A list that has been initialized but contains no elements, for example:
List<String> list = new ArrayList<>();
- Empty Array: An array that has been initialized with a specific length but contains no values:
String[] array = new String[0];
To avoid confusion, remember that an empty list and an empty array are still objects, hence they can be instantiated, while null is not.
When converting between these types, try to ensure that you're handling potential null values properly to avoid exceptions. It's advisable to always check and fill lists or arrays as needed.
Keep these distinctions in mind to avoid pitfalls in your code! 🚀
Understanding Null, Empty List, and Empty Array in Java
As a programmer, it’s essential to differentiate between null, empty lists, and empty arrays when working in Java. Here’s a quick breakdown from my experience:
- Null: It means the reference points to nothing. Accessing it will lead to a NullPointerException. - Empty List: A list that has been initialized but contains no elements, for example:
List<String> list = new ArrayList<>();
- Empty Array: An array that has been initialized with a specific length but contains no values:
String[] array = new String[0];
To avoid confusion, remember that an empty list and an empty array are still objects, hence they can be instantiated, while null is not.
When converting between these types, try to ensure that you're handling potential null values properly to avoid exceptions. It's advisable to always check and fill lists or arrays as needed.
Keep these distinctions in mind to avoid pitfalls in your code! 🚀
BY Top Java Quiz Questions ☕️
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Telegram auto-delete message, expiring invites, and more
elegram is updating its messaging app with options for auto-deleting messages, expiring invite links, and new unlimited groups, the company shared in a blog post. Much like Signal, Telegram received a burst of new users in the confusion over WhatsApp’s privacy policy and now the company is adopting features that were already part of its competitors’ apps, features which offer more security and privacy. Auto-deleting messages were already possible in Telegram’s encrypted Secret Chats, but this new update for iOS and Android adds the option to make messages disappear in any kind of chat. Auto-delete can be enabled inside of chats, and set to delete either 24 hours or seven days after messages are sent. Auto-delete won’t remove every message though; if a message was sent before the feature was turned on, it’ll stick around. Telegram’s competitors have had similar features: WhatsApp introduced a feature in 2020 and Signal has had disappearing messages since at least 2016.
Export WhatsApp stickers to Telegram on Android
From the Files app, scroll down to Internal storage, and tap on WhatsApp. Once you’re there, go to Media and then WhatsApp Stickers. Don’t be surprised if you find a large number of files in that folder—it holds your personal collection of stickers and every one you’ve ever received. Even the bad ones.Tap the three dots in the top right corner of your screen to Select all. If you want to trim the fat and grab only the best of the best, this is the perfect time to do so: choose the ones you want to export by long-pressing one file to activate selection mode, and then tapping on the rest. Once you’re done, hit the Share button (that “less than”-like symbol at the top of your screen). If you have a big collection—more than 500 stickers, for example—it’s possible that nothing will happen when you tap the Share button. Be patient—your phone’s just struggling with a heavy load.On the menu that pops from the bottom of the screen, choose Telegram, and then select the chat named Saved messages. This is a chat only you can see, and it will serve as your sticker bank. Unlike WhatsApp, Telegram doesn’t store your favorite stickers in a quick-access reservoir right beside the typing field, but you’ll be able to snatch them out of your Saved messages chat and forward them to any of your Telegram contacts. This also means you won’t have a quick way to save incoming stickers like you did on WhatsApp, so you’ll have to forward them from one chat to the other.
