How do I use contravariance in Java?
An example of an AI chatbot conversation about using contravariance in Java.
How do I use contravariance in Java?
Contravariance in Java allows you to use a supertype in place of a subtype. It’s often used with generics.
Can you give me an example of contravariance in action?
Sure! If you have a method that accepts a List<Object>, you can pass a List<String> to it because String is a subtype of Object.
What about wildcards? How do they relate to contravariance?
Wildcards are used in generics to express contravariance. You can use the syntax List<? super T> to indicate that the list can accept T or any supertype of T.
Are there any limitations to using contravariance?
Yes, one limitation is that you cannot add items to a contravariant collection, except for null, because the exact type is unknown.
Use ChatGPT in Telegram
Get this answer and more from ChatGPT in Telegram, try it for free!
Get Started For FreeWhat can MagicBuddy do?
The Friendly AI in Your Pocket
Powered by advanced language models trained on billions of online words and conversations, MagicBuddy delivers friendly and helpful chat on demand.
Ask questions and get answers. Crack jokes and get laughs. Or even get writing ideas and study help. MagicBuddy's conversational intelligence allows for a truly unique and useful chat experience.
Curious? Try these prompts:
Telegram's Best AI-Powered Chatbot
MagicBuddy is incredibly easy to use and the responses are lightning fast! 🥇
Impressive! MagicBuddy is my go-to AI assistant. It’s quick, accurate, and user-friendly.
Sending voice messages makes it easier to use in the middle of the day and the answers are super fast.
Love it! A friend of mine told me about it and it has made my life so much easier. It’s like having a helpful friend in my pocket!
I use 2 months already, simply amazing! MagicBuddy delivers answers in a snap. It’s a must-have tool for staying informed!
Game-changer! MagicBuddy’s speed and accuracy are unmatched. It’s my secret weapon for productivity
Talk to ChatGPT on Telegram
Say Hello to Your New Telegram BFF - Try MagicBuddy Free!
Get Started For Free