HTML Responsive Images and Source Selection
HTML Responsive Images and Source Selection. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
Developer interview notes & guides — Page 21
Focused explanations and longer guides, with worked scenarios, common mistakes and interview exercises across every chapter.
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Showing 481–504 of 825 articles
CSS Responsive Units and Content Constraints
CSS Responsive Units and Content Constraints. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
HTML Landmarks and Meaningful Page Structure
HTML Landmarks and Meaningful Page Structure. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
CSS Z-Index and Stacking Contexts
CSS Z-Index and Stacking Contexts. Learn the reasoning, a practical example, common mistakes and an interview exercise.
~2 min readread →
Java ArrayList Capacity and Performance
How ArrayList grows its backing array by 1.5x, why add is amortized O(1), and when ensureCapacity or a different list actually helps.
~8 min readread →
Java Comparators and Ordered Collections
Why TreeSet and TreeMap drop elements when a Comparator disagrees with equals, and how to write comparators that obey the full contract.
~6 min readread →
Java CompletableFuture Error Composition
How exceptions travel through CompletableFuture chains, when to use exceptionally, handle or whenComplete, and why causes arrive wrapped.
~7 min readread →
Java Concurrent Collections and Compound Operations
Why check-then-act on ConcurrentHashMap still races, and how merge, compute and putIfAbsent make compound updates atomic per key.
~7 min readread →
Java Equals and HashCode Collection Contracts
The equals and hashCode contract explained: why equal objects need equal hash codes, how HashMap uses both, and how to write a correct pair.
~6 min readread →
Java Exceptions and Recovery Boundaries
Checked vs unchecked exceptions in Java, where to catch, when to wrap with a cause, and how to avoid swallowing failures at the wrong layer.
~6 min readread →
Java Executors and Task Lifecycle
How shutdown, shutdownNow and awaitTermination differ in ExecutorService, and the safe pattern for stopping thread pools without losing work.
~6 min readread →
Java Garbage Collection and Retained Objects
How Java memory leaks happen despite garbage collection: GC roots, reachability, retained size, and finding the reference chain in a heap dump.
~7 min readread →
Java HashMap Collisions and Key Quality
How HashMap works internally: hash spreading, bucket index, collisions, load factor resizing and the Java 8 switch from chains to trees.
~7 min readread →
Java Immutable Objects and Defensive Copies
How to make a class immutable in Java: final fields, no setters, defensive copies of mutable inputs and outputs, and safe publication.
~6 min readread →
Java Time Types and Zone-Aware Decisions
When to use Instant, LocalDateTime, ZonedDateTime and OffsetDateTime, and how daylight saving gaps and overlaps break naive date code.
~6 min readread →
Java Optional as an Absence Contract
When to return Optional in Java, why get and isPresent checks miss the point, and why Optional fields, parameters and collections are a smell.
~6 min readread →
Java Records and Shallow Immutability
What Java records generate, why they are only shallowly immutable, how compact constructors copy and validate, and where records do not fit.
~6 min readread →
Java Streams and Lazy Pipelines
Why Java stream intermediate operations do nothing until a terminal operation runs, how elements flow one by one, and where laziness bites.
~6 min readread →
Java Stream Reuse and Collection Ownership
Why reusing a Java stream throws IllegalStateException, how to share data with a Supplier or a collection, and what toList returns.
~6 min readread →
Java String Equality and Identity
Java String equals vs ==: why == compares references, how the string pool and compile-time constants make it seem to work, and safe comparisons.
~6 min readread →
Java Synchronized Blocks and Shared Invariants
What synchronized guarantees in Java: mutual exclusion, visibility and reentrancy, plus how to guard multi-field invariants with one lock.
~7 min readread →
Java Thread Visibility and Happens-Before
Why one Java thread may never see another's write, what volatile guarantees, and how happens-before rules make publication safe.
~7 min readread →
Java Try-With-Resources and Cleanup
How try-with-resources closes resources in reverse order, keeps the primary exception with suppressed close failures, and beats finally.
~6 min readread →
Java Virtual Threads and Blocking Workloads
When Java 21 virtual threads help, why they do not speed up CPU-bound work, and how pinning, pooling and resource limits trip teams up.
~7 min readread →
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