Former senior programmer at a Fortune Global 500 company, dedicated to sharing Java expertise. Visit Feng's site: Java Knowledge Sharing, www.java1234.com
The article explains that big‑tech firms ask deep, “onion‑layer” questions to gauge a candidate’s potential and thinking ability, while smaller companies focus on detailed, practical queries to confirm immediate competence, and mismatches between these expectations often cause interview silence.
The article walks through three concrete optimizations—batch SQL, JDBC batch mode with rewriteBatchedStatements, and multithreaded parallel inserts—that shrink a 100,000‑row MyBatis insertion from five minutes to three seconds, while highlighting configuration details, performance gains, and common pitfalls.
The article analyzes three common forms of bad encapsulation in Java—over‑encapsulation, false encapsulation, and chaotic encapsulation—illustrates their hidden risks with concrete code examples, and offers practical principles to restore clear responsibilities, minimal interfaces, and flexible design.
This article presents seven concrete Spring Boot startup optimization techniques—including lazy bean initialization, precise component scanning, JVM flag tuning, auto‑configuration pruning, class‑loading shortcuts, lazy database connections, and GraalVM native compilation—backed by real‑world benchmarks that reduce launch times by up to 71% across e‑commerce, micro‑service, logistics and payment services.
Spring Boot packages all dependencies and an embedded web server into a single executable JAR, allowing developers to launch the application with a simple "java -jar" command without external configuration or server deployment.
NginxPulse is a lightweight, Docker‑ready Nginx log analysis panel built with Go‑Gin backend and Vue3 frontend, offering real‑time PV/UV, IP geolocation, multi‑site support, custom log formats, remote log fetching, and easy deployment via a single command or Compose file.
This article explains four practical ways to determine when tasks submitted to a Java ExecutorService have finished—using Future's isDone/get, ExecutorService.invokeAll, CompletionService, and CountDownLatch—each with code examples and usage guidance.
Java 25, the newest LTS release, introduces a suite of language and runtime enhancements—including primitive‑type pattern matching, module‑wide imports, a lightweight main method, richer records, structured concurrency, scoped values, a vector API, and security updates—that together make Java code more concise, safer, and higher‑performing for both newcomers and seasoned developers.
The article evaluates 13 Java web frameworks across performance, ecosystem maturity, learning curve, development efficiency, enterprise adoption, and innovation, providing concrete metrics, strengths, suitable scenarios, and a tiered ranking from dominant to legacy options.
Redis stores data in memory, so when usage reaches the maxmemory limit it triggers one of six eviction policies—noeviction, allkeys‑lru, volatile‑lru, allkeys‑random, volatile‑random, and volatile‑ttl—each suited to different scenarios, and can be set via redis.conf or CONFIG SET, as illustrated with a Java Jedis example.
