What is it and how can I use extends and Abstract in a public main?

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Hi, I’m a beginner in programming and am currently learning in the game development course. The course teacher couldn’t make it clear to me what it is and how to use extends and Abstract, I watched the entire object orientation module in java 3 times and I couldn’t absorb anything about it. If any expert can help me with this by explaining it in the dumbest way for me I thank :D

public class Main extends(Exemplo){}

public abstract class Main{}
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  • I did the editing and added the tag java the question.

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    In the background the question is broad because it involves two concepts, I marked one of them, the other I think it is better to look at the tag who has several answers on this https://answall.com/questions/tagged/heran%C3%a7a? tab=Votes. Otherwise it’s complicated because we don’t know what you saw, because you didn’t understand, what the specific point is, if you’re prepared to understand that concept, any answer can be useless, the question has no specificity.

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