Oracle Certified Professional: Java SE 17 DeveloperThe Complete Beginner's Guide

Java Basics and Object-Oriented Programming Principles

Objective 1.1 · Use primitives and wrapper classes, including operators, parentheses, type promotion, and casting.

Working with Java Data Types

Objective 1.2 · Declare and initialize variables (including those of reference type), check variable initialization, and use var for local variable type inference.

Controlling Program Flow

Objective 2.1 · Branching: if, if-else, switch, and expressions including break and continue.

Iterations and Loops

Objective 2.2 · Create and use loops: while, for, for-each, and nested loops with break and continue.

Java Object-Oriented Programming Deep Dive

Objective 3.1 · Declare and instantiate Java objects, initialize objects, and use constructors, access modifiers, and encapsulation.

Inheritance and Polymorphism

Objective 3.2 · Create and use subclasses and superclasses, including abstract classes, method overriding, and the Object class.

Interfaces and Lambda Expressions

Objective 3.3 · Create and use interfaces, including default and static methods, and use functional interfaces and lambda expressions.

Exceptions and Assertions

Objective 4.1 · Use try-catch-throw and multi-catch clauses, including try-with-resources and assertions.

Arrays, Collections, and Generics

Objective 5.1 · Use arrays, lists, sets, maps, and stacks, including generic types and utility methods (e.g., Collections, Arrays).

Streams and Lambda Pipelines

Objective 6.1 · Use streams to process collections and arrays, including filtering, mapping, reducing, and collecting operations.

Java I/O and NIO File Handling

Objective 7.1 · Read and write data using I/O streams (FileInputStream, FileOutputStream, BufferedReader, etc.) and use NIO.2 Path, Files, and DirectoryStream.

Functional Programming with Optional and Streams

Objective 6.2 · Use Optional, functional interfaces (Consumer, Supplier, Predicate, Function), and method references.

Date, Time, and Localization

Objective 8.1 · Use LocalDate, LocalTime, LocalDateTime, Instant, Period, Duration, and apply locale-specific formatting.

Concurrency and Threads

Objective 9.1 · Create and manage threads using Runnable, Callable, ExecutorService, and use synchronization and concurrent collections.

JDBC Database Access

Objective 10.1 · Use JDBC to connect to a database, execute queries (Statement, PreparedStatement, CallableStatement), and process results (ResultSet).

Annotations and Reflection

Objective 11.1 · Define and use annotations, including built-in annotations, and use reflection to inspect classes, methods, and fields.

Modules and Modular Applications

Objective 12.1 · Describe the modular JDK, create and export modules, use module declarations, and understand module dependencies.

Security and Best Practices

Objective 13.1 · Apply secure coding practices (encapsulation, immutability, input validation) and avoid common vulnerabilities.