Java SE: Exploiting Modularity and Other New Features Ed 1.1 — Lesson 3: Modern Language Features, Collections, Streams, Optional, and Concurrency

Technical Scope

• local variable type inference, switch expressions, records or sealed-type context
• collection factory methods, immutable data, Optional, and API refinements
• stream enhancements, collectors, predicates, and parallelism trade-offs
• CompletableFuture, concurrency utilities, testing, and exception behavior

Instructor Demonstration

Demonstrate local variable type inference, switch expressions, records or sealed-type context within a legacy Java application decomposed into explicit modules, upgraded to modern language and API features, tested for compatibility, and packaged for reliable deployment, then capture the exact configuration, command, transaction, report, trace, or code evidence that proves the expected result.

Applied Workshop

Implement a controlled workshop covering collection factory methods, immutable data, Optional, and API refinements and stream enhancements, collectors, predicates, and parallelism trade-offs, then test a failure, exception, or business-control scenario involving CompletableFuture, concurrency utilities, testing, and exception behavior.

1. Confirm the environment, identities, data, dependencies, controls, and expected result.
2. Complete the product-specific configuration, development, analysis, or business-process task.
3. Capture commands, configuration, output, logs, transactions, reports, or test evidence.
4. Explain the operational, security, performance, data-quality, or business trade-off.

Validation Standard

The Modern Language Features, Collections, Streams, Optional, and Concurrency result must be reproducible, traceable to approved inputs, and consistent with expected Oracle product or business-process behavior.

• The intended target, scope, and ownership are verified.
• The result is supported by reproducible evidence and expected-value checks.
• Security, performance, reliability, data quality, and support impact are reviewed.
• Unexpected behavior is investigated before acceptance or release.

Failure Analysis

Diagnose issues in local variable type inference, switch expressions, records or sealed-type context, collection factory methods, immutable data, Optional, and API refinements, stream enhancements, collectors, predicates, and parallelism trade-offs, or CompletableFuture, concurrency utilities, testing, and exception behavior without making an unverified production change.

Learners isolate the smallest proven cause, apply a reversible correction, rerun validation, and record the preventive action.

Practical Outcome

Complete a validated implementation or analysis for Modern Language Features, Collections, Streams, Optional, and Concurrency and defend the result with documented evidence.