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What does the PECS principle stand for in Java generics?

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In Java generics, what does `? extends T` mean?

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What is the purpose of `Collectors.teeing()` introduced in Java 12?

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What happens when you call `stream.forEach()` on a parallel stream?

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What is the difference between `Predicate.and()` and `Predicate.or()` in Java streams?

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What does `Enum.values()` return?

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What is the difference between `LinkedList` and `ArrayList` regarding random access performance?

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Which functional interface represents a function that takes no arguments and returns a value?

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What does `instanceof` pattern matching (Java 16+) allow you to do?

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Which keyword prevents a method from being overridden?

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What is the result of `Math.floorDiv(-7, 2)` in Java?

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Which annotation marks a method as deprecated?

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What is the default capacity of an `ArrayList` when created with the no-argument constructor?

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Which method of `ExecutorService` blocks until all submitted tasks complete?

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What does `List.of(1, 2, 3)` produce in Java 9+?

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What is the purpose of the `default` keyword in an interface?

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Which of the following is an unchecked exception?

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What does `Thread.sleep(1000)` do?

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