Java SE 17: Programming Complete — Lesson 1: Java Language, Classes, Objects, Records, Sealed Types, and Core APIs

Learning Objectives

• Explain the purpose and operating context of Java platform, source, bytecode, JVM, variables, operators, and control flow.
• Apply classes, objects, constructors, encapsulation, inheritance, and polymorphism and interfaces, enums, records, sealed classes, pattern matching awareness, and immutability in a controlled environment.
• Validate outcomes and troubleshoot risks involving String, date and time, numbers, localization awareness, and unit tests.

Detailed Topics

• Java platform, source, bytecode, JVM, variables, operators, and control flow
• classes, objects, constructors, encapsulation, inheritance, and polymorphism
• interfaces, enums, records, sealed classes, pattern matching awareness, and immutability
• String, date and time, numbers, localization awareness, and unit tests

Instructor Demonstration

Demonstrate Java platform, source, bytecode, JVM, variables, operators, and control flow for a modular Java application implemented from core language design through concurrent processing and database integration; capture the exact configuration, code, command, transaction, query, dashboard, model, schedule, or report evidence that proves the expected result.

Hands-On Exercise

Complete a controlled Java SE 17: Programming Complete exercise covering classes, objects, constructors, encapsulation, inheritance, and polymorphism and interfaces, enums, records, sealed classes, pattern matching awareness, and immutability; introduce an exception involving String, date and time, numbers, localization awareness, and unit tests, diagnose it from evidence, apply the smallest reversible correction, and rerun acceptance checks.

1. Confirm scope, prerequisites, identities, dependencies, data, risks, and expected outcome.
2. Perform the course-specific configuration, development, administration, analysis, or business-process workflow.
3. Capture commands, settings, records, logs, screenshots, reports, metrics, or test results.
4. Compare the observed result with acceptance criteria and document corrective or preventive action.

Scenario Analysis

• Identify the technical or business decision and the stakeholders affected by it.
• Compare security, performance, reliability, compliance, cost, usability, and support trade-offs.
• Define rollback, recovery, communication, evidence, ownership, and escalation requirements.

Troubleshooting Guidance

Diagnose issues involving Java platform, source, bytecode, JVM, variables, operators, and control flow, classes, objects, constructors, encapsulation, inheritance, and polymorphism, interfaces, enums, records, sealed classes, pattern matching awareness, and immutability, String, date and time, numbers, localization awareness, and unit tests without making an unverified production change. Separate symptoms from causes, gather time-correlated evidence, test a reversible hypothesis, validate the correction, and record recurrence controls.

Validation Checklist

• The requirement, environment, inputs, dependencies, and expected result are documented.
• The result is reproducible and supported by product-specific evidence.
• Normal, boundary, failure, security, performance, and operational conditions are reviewed.
• Exceptions, rollback, ownership, support actions, and the next improvement priority are recorded.

Lesson Outcome

Learners can apply Java Language, Classes, Objects, Records, Sealed Types, and Core APIs in a realistic Java SE 17: Programming Complete scenario and defend the result with documented evidence.