1Z0-829: Java SE 17 Developer

Java building blocks

• Primitive and reference types
• var and local variable type inference
• Wrapper classes and autoboxing
• Scope and garbage collection

Operators

• Operator precedence
• Casting and numeric promotion
• Equality and identity

• Lab: Predict and verify output for tricky expressions · 40 min

Text and dates

• String and StringBuilder
• Text blocks
• Math API
• Date and time API: LocalDate, Duration, Period, time zones

• Lab: Build a scheduling utility with the date-time API · 45 min

Controlling flow

• if, loops and labels
• Switch statements and expressions
• Pattern matching for instanceof

• Lab: Refactor legacy code with switch expressions and pattern matching · 40 min

Classes and objects

• Constructors and initialisation order
• Access modifiers and encapsulation
• Static and instance members
• Overloading

Inheritance and types

• Inheritance and overriding
• Abstract classes and interfaces
• Records
• Enums
• Sealed classes
• Nested and anonymous classes

• Lab: Model a domain with records, sealed interfaces and enums · 55 min

Exceptions

• Checked and unchecked exceptions
• try, catch, finally
• try-with-resources
• Custom exceptions

• Lab: Robust file processing with try-with-resources · 35 min

Arrays and collections

• Arrays and the Arrays class
• List, Set, Map and Deque
• Immutable collections
• Sorting with Comparable and Comparator

• Lab: Implement an inventory with collections and comparators · 45 min

Generics

• Generic classes and methods
• Bounded types and wildcards
• Type erasure

Lambdas and functional interfaces

• Lambda syntax
• Built-in functional interfaces
• Method references
• Optional

Streams

• Creating streams
• Intermediate and terminal operations
• Collectors: grouping, partitioning, mapping
• Primitive streams
• Parallel streams

• Lab: Analyse sales data with streams and collectors · 55 min

Concurrency

• Threads and Runnable
• ExecutorService and Callable
• Synchronisation and locks
• Concurrent collections
• Thread-safety pitfalls

• Lab: Process tasks concurrently with an executor · 45 min

I/O and NIO.2

• Streams, readers and writers
• Serialisation
• Path and Files
• Walking and searching directories

• Lab: File utility with NIO.2 · 35 min

JDBC and localisation

• Connections and PreparedStatement
• ResultSet processing
• Transactions
• Locales, resource bundles and formatting

Modules and packaging

• module-info.java
• requires, exports and services
• Migrating to modules
• jar, jdeps and jlink

• Lab: Modularise a small application · 35 min

Exam readiness

• Common traps
• Timed practice on code samples
• Review and next steps