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Introduction So far in this series, we've learned: Why Java introduced the new Date & Time API. How every java.time class works. Which Java type should be used for different…
Introduction Every enterprise application stores dates and timestamps. Whether you're building a banking platform, payment gateway, insurance application, e-commerce website, healthcare system, or event management platform, almost every table contains…
Introduction In the previous article, we explored every major class in the Java 8 Date & Time API and learned the purpose of classes such as LocalDate, LocalTime, LocalDateTime, Instant,…
Introduction In the previous article, we explored why Java replaced the legacy Date and Calendar APIs with the modern Java Date & Time API (JSR-310). We learned about the shortcomings…
Introduction Ask any experienced Java developer about the most frustrating APIs in Java before version 8, and one answer appears almost every time: Date and Time handling. For nearly two…
Introduction One of the most impressive capabilities introduced in Java 8 was the ability to process collections in parallel with almost no changes to application code. Changing this: employees.stream() to…
Introduction One of the most impressive capabilities introduced in Java 8 was the ability to process collections in parallel with almost no changes to application code. Changing this: employees.stream() to…
Introduction Throughout this Stream API series, we've used many built-in collectors: toList() toSet() groupingBy() partitioningBy() mapping() joining() counting() summingInt() averagingDouble() maxBy() minBy() These collectors solve most day-to-day programming problems. But…
Introduction In the previous articles, we explored Collectors.groupingBy() and discovered how it can transform large collections into meaningful reports, dashboards, and analytical summaries. groupingBy() is ideal when data needs to…
Introduction In the previous article, we explored Collectors.groupingBy() and learned how to group Stream elements into logical categories such as departments, cities, and transaction dates. While grouping data is useful,…