Java SE 21 Developer (1Z0-830)

Module 1: Working with Java Data Types

Module Introduction

Lesson 1: Operations and core data types

Learning objectives
1.1 Java operators–Part 1
1.2 Java operators–Part 2
1.3 Promotions
1.4 Casting
1.5 Wrapper classes
1.6 Primitives, references, aliasing, and equality
1.7 Question deep dive

Lesson 2: Handling text

Learning objectives
2.1 String and StringBuilder
2.2 Methods of the String class
2.3 Text blocks
2.4 Methods of the StringBuilder class
2.5 Question deep dive

Lesson 3: The date-time API

Learning objectives
3.1 Date-time API foundations–Part 1
3.2 Date-time API foundations–Part 2
3.3 Manipulating date-time objects
3.4 Time-zone considerations–Part 1
3.5 Time-zone considerations–Part 2
3.6 Time-zone considerations–Part 3
3.7 Question deep dive

Module 2: Controlling Program Flow and Exception Handling

Module Introduction

Lesson 4: Fundamentals of flow control

Learning objectives
4.1 Simple loops
4.2 Control using break and continue
4.3 Using if/else statements
4.4 Using switch statements
4.5 The arrow form of switch
4.6 Expressions with switch
4.7 Pattern matching with switch
4.8 Question deep dive

Lesson 5: Flow control with exceptions

Learning objectives
5.1 Flow control with try/catch/finally
5.2 Flow control with try-with-resources
5.3 Multi-catch and rethrowing
5.4 Implementing AutoCloseable–Part 1
5.5 Implementing AutoCloseable–Part 2
5.6 Question deep dive

Lesson 6: Custom exceptions

Learning objectives
6.1 Subclassing Throwable types
6.2 Question deep dive

Module 3: Java Object-Oriented Approach

Module Introduction

Lesson 7: Class definition, and reachability

Learning objectives
7.1 Source files and basic type declarations
7.2 Nested type declarations
7.3 Inner class declarations–Part 1
7.4 Inner class declaration–Part 2
7.5 Local and anonymous class declarations
7.6 Reachability analysis
7.7 Question deep dive

Lesson 8: Defining class contents

Learning objectives
8.1 Instance and static fields–Part 1
8.2 Instance and static fields–Part 2
8.3 Instance and static methods–Part 1
8.4 Instance and static methods–Part 2
8.5 Variable length argument handling
8.6 Overloaded and overridden methods–Part 1
8.7 Overloaded and overridden methods–Part 2
8.8 Defining records
8.9 Features of records
8.10 Question deep dive

Lesson 9: Initialization of objects

Learning objectives
9.1 Static initialization
9.2 Instance initialization
9.3 Question deep dive

Lesson 10: Scope, encapsulation, and immutability

Learning objectives
10.1 Rules of scope
10.2 Access control modifiers
10.3 Encapsulation requirements
10.4 Immutability requirements
10.5 Question deep dive

Lesson 11: Local variable type inference

Learning objectives
11.1 Using var for regular variables
11.2 Additional uses and restrictions of var
11.3 Question deep dive

Lesson 12: Implementation inheritance

Learning objectives
12.1 Subclass declaration
12.2 Subclass initialization
12.3 Abstract class constraints
12.4 Sealed type hierarchies
12.5 Special cases in sealed type hierarchies
12.6 Question deep dive

Lesson 13: Working with polymorphism

Learning objectives
13.1 Object and reference type
13.2 Pattern matching in instanceof
13.3 Additional topics in pattern-matched instanceof
13.4 Possible and impossible casts
13.5 Virtual method invocation
13.6 Covariant returns
13.7 Question deep dive

Lesson 14: Interfaces

Learning objectives
14.1 Interfaces, methods and functional interfaces
14.2 Interface implementation
14.3 Default method resolution
14.4 Question deep dive

Lesson 15: Enumerations

Learning objectives
15.1 Enum values and initialization
15.2 Enum fields and methods
15.3 Question deep dive

Module 4: Working with Arrays and Collections

Module Introduction

Lesson 16: Generics and generic declarations

Learning objectives
16.1 Fundamentals of generics
16.2 Declaring generic types and methods
16.3 Using bounds and wildcards
16.4 Question deep dive

Lesson 17: Java core collections

Learning objectives
17.1 Arrays, and methods of Collection, List, and Set–Part 1
17.2 Arrays, and methods of Collection, List, and Set–Part 2
17.3 Methods of Deque and Map
17.4 Question deep dive

Lesson 18: Comparator, Comparable, and ordering

Learning objectives
18.1 Comparison methods and interfaces
18.2 Sorting arrays and Collections
18.3 Comparator factories and decorators
18.4 Question deep dive

Module 5: Working with Streams and Lambda Expressions

Module Introduction

Lesson 19: Defining lambda expressions

Learning objectives
19.1 Lambda expression syntax variations
19.2 Lambda expression contexts
19.3 Core functional interfaces
19.4 Method references
19.5 Question deep dive

Lesson 20: Fundamental Stream operations

Learning objectives
20.1 The monad-like methods
20.2 Stream utilities
20.3 Simple terminal methods and laziness
20.4 Question deep dive

Lesson 21: Reduction operations, and parallelism

Learning objectives
21.1 Collection and reduction–Part 1
21.2 Collection and reduction–Part 2
21.3 Grouping and partitioning with Collectors
21.4 Downstream operations with Collectors
21.5 Parallel stream operation
21.6 Question deep dive

Module 6: Java Platform Module System

Module Introduction

Lesson 22: Building and executing modules

Learning objectives
22.1 Module compilation
22.2 Module execution
22.3 Question Deep Dive

Lesson 23: Coding modules

Learning objectives
23.1 Exports and requires directives
23.2 Provides, uses, open and opens directives
23.3 Question Deep Dive

Lesson 24: Migration, and command line operations

Learning objectives
24.1 Project Migration–Part 1
24.2 Project Migration–Part 2
24.3 Command-line utilities
24.4 Question Deep Dive

Module 7: Concurrency

Module Introduction

Lesson 25: Create and execute threads

Learning objectives
25.1 Runnable and Thread
25.2 ExecutorService and Future
25.3 ExecutorService lifecycle–Part 1
25.4 ExecutorService lifecycle–Part 2
25.5 Virtual threads 12 m
25.6 Question Deep Dive

Lesson 26: Thread-safe code, locking, and synchronization

Learning objectives
26.1 Race conditions, deadlock, and livelock
26.2 Transactional integrity
26.3 Visibility
26.4 Concurrent queues and collections
26.5 Synchronizers, locks, and atomic types–Part 1
26.6 Synchronizers, locks, and atomic types–Part 2
26.7 Question Deep Dive

Module 8: Java IO

Module Introduction

Lesson 27: Fundamental IO operations

Learning objectives
27.1 Input and Output streams, Reader and Writer
27.2 BufferedReader, PrintWriter, Scanner and Charset conversions
27.3 Question Deep Dive

Lesson 28: Java serialization

Learning objectives
28.1 Default serialization
28.2 Customizing serialization
28.3 Question Deep Dive

Lesson 29: Files, Path, and Channel

Learning objectives
29.1 Files methods–Part 1
29.2 Files methods–Part 2
29.3 Working with Channel
29.4 Question Deep Dive

Module 9: Localization in Java SE Applications

Module Introduction

Lesson 30: Localization

Learning objectives
30.1 Parsing, formatting, and locale
30.2 ResourceBundle and data lookup
30.3 Question Deep Dive

Summary

Java SE 21 Developer (1Z0-830): Summary