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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In recent times, Telegram has gained a lot of popularity because of the controversy over WhatsApp’s new privacy policy. In January 2021, Telegram was the most downloaded app worldwide and crossed 500 million monthly active users. And with so many active users on the app, people might get messages in bulk from a group or a channel that can be a little irritating. So to get rid of the same, you can mute groups, chats, and channels on Telegram just like WhatsApp. You can mute notifications for one hour, eight hours, or two days, or you can disable notifications forever.
Telegram Be The Next Best SPAC
I have no inside knowledge of a potential stock listing of the popular anti-Whatsapp messaging app, Telegram. But I know this much, judging by most people I talk to, especially crypto investors, if Telegram ever went public, people would gobble it up. I know I would. I’m waiting for it. So is Sergei Sergienko, who claims he owns $800,000 of Telegram’s pre-initial coin offering (ICO) tokens. “If Telegram does a SPAC IPO, there would be demand for this issue. It would probably outstrip the interest we saw during the ICO. Why? Because as of right now Telegram looks like a liberal application that can accept anyone - right after WhatsApp and others have turn on the censorship,” he says.
