Question 1

How to use lambda expressions in Java 8?

Accepted Answer

Lambda expressions provide a concise syntax for anonymous functions, replacing verbose anonymous classes. The tutorial shows examples like sorting lists with (a, b) -> b.compareTo(a), making code shorter and more readable.

Question 2

What are the benefits of streams over traditional loops?

Accepted Answer

Streams enable functional operations like filter, map, and reduce for declarative data processing. They improve code clarity and support parallel execution, as demonstrated in the tutorial with performance comparisons for sorting.

Question 3

How to avoid null pointer exceptions with Optional?

Accepted Answer

Use the Optional class to wrap nullable values and provide safe access methods like orElse. The tutorial explains how Optional.of and ifPresent can eliminate null checks, though it requires adopting a functional style.

Question 4

Java 8 vs Java 11: which should I learn?

Accepted Answer

Java 8 introduces core functional features like lambdas and streams, which are foundational. However, Java 11 adds newer APIs and performance improvements; the author recommends their Java 11 tutorial for updates, so consider both for modern development.

Question 5

How to implement parallel streams in Java 8?

Accepted Answer

Switch from stream() to parallelStream() on collections to enable concurrent processing. The tutorial includes a benchmark showing parallel sort can be ~50% faster, but notes it's best for large datasets due to overhead.

Question 6

Is the new Date API better than the old one?

Accepted Answer

Yes, the java.time package offers immutable and thread-safe classes like LocalDate, simplifying date manipulation and timezone handling. The tutorial provides examples parsing and formatting dates without the pitfalls of legacy classes.

Modern Java - A Guide to Java 8

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