Question: 1)what is Array? 2)What is the difference b/w length and length() ? 3)What is Recursion? 4) What is Enum? 5) what is Wrapper classes?

1)what is Array?
2)What is the difference b/w length and length() ?
3)What is Recursion?
4) What is Enum?
5) what is Wrapper classes?

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