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When should you prefer custom collectors and when should you avoid it?

How do you use flatMap with a simple code example?

flatMap Java Stream API functional programming

What is parallel streams in Java?

parallel streams Java 8 Stream API multi-threading functional programming performance improvement concurrency

What are alternatives to lambda expressions and how do they compare?

alternatives lambda expressions anonymous inner classes method references functional interfaces Java programming

How do you test code that uses method references?

Java Method References Lambda Expressions Testing Java Code Clean Code

How has Optional changed in recent Java versions?

Optional Java null safety functional programming Java 8 Java 9 Java 10 enhancements

What are best practices for working with collectors?

Collectors Java Stream API Best Practices Grouping Performance Optimization

How does map, filter, reduce behave in multithreaded code?

Java multithreading map filter reduce Stream API parallel processing

How does Stream API overview impact performance or memory usage?

Stream API Java performance memory usage parallel processing functional programming

What are common mistakes developers make with happens-before relationships?

Java concurrency happens-before relationship multi-threading mistakes Java Memory Model synchronization issues volatile keyword.

When should you prefer race conditions and visibility and when should you avoid it?

Java Race Conditions Multithreading Thread Safety Synchronization

How do you use deadlocks and livelocks with a simple code example?

deadlock livelock concurrency multithreading PHP thread management

What is CompletableFuture in Java?

CompletableFuture Java Asynchronous Non-blocking Concurrency

What are alternatives to ConcurrentLinkedQueue and how do they compare?

ConcurrentLinkedQueue Java Collections Concurrent Data Structures BlockingQueue Thread Safety Multi-threading

How do you test code that uses BlockingQueue?

BlockingQueue Concurrency Java Unit Testing PHPUnit

How has Semaphore changed in recent Java versions?

Semaphore Java Concurrency Java Semaphore Changes Java 8 Java 9 Java 11 synchronization

What are best practices for working with Phaser?

Phaser game development JavaScript HTML5 best practices game optimization

How does CyclicBarrier behave in multithreaded code?

CyclicBarrier multithreading thread synchronization concurrent programming Java concurrency

How does CountDownLatch impact performance or memory usage?

CountDownLatch performance memory usage synchronization threads concurrency

What are common mistakes developers make with ThreadLocal?

ThreadLocal Java memory leaks multithreading ThreadLocal mistakes