Oracle Certified Professional Java SE 11 Developer
1 Java Fundamentals
1-1 Java Basics
1-1 1 Java Platform Overview
1-1 2 Java Development Environment
1-1 3 Java Program Structure
1-1 4 Java Virtual Machine (JVM)
1-1 5 Java Development Kit (JDK)
1-1 6 Java Runtime Environment (JRE)
1-2 Object-Oriented Programming (OOP) Concepts
1-2 1 Classes and Objects
1-2 2 Inheritance
1-2 3 Polymorphism
1-2 4 Encapsulation
1-2 5 Abstraction
1-2 6 Interfaces
1-2 7 Abstract Classes
1-3 Data Types and Variables
1-3 1 Primitive Data Types
1-3 2 Reference Data Types
1-3 3 Variable Declaration and Initialization
1-3 4 Type Conversion and Casting
1-3 5 Arrays
1-4 Control Flow
1-4 1 Conditional Statements (if, else, switch)
1-4 2 Looping Constructs (for, while, do-while)
1-4 3 Break and Continue Statements
1-4 4 Exception Handling
2 Java Collections Framework
2-1 Collections Overview
2-1 1 Collection Interfaces
2-1 2 Collection Classes
2-1 3 Collection Algorithms
2-2 Lists
2-2 1 ArrayList
2-2 2 LinkedList
2-2 3 List Operations
2-3 Sets
2-3 1 HashSet
2-3 2 TreeSet
2-3 3 LinkedHashSet
2-4 Maps
2-4 1 HashMap
2-4 2 TreeMap
2-4 3 LinkedHashMap
2-5 Queues and Deques
2-5 1 PriorityQueue
2-5 2 ArrayDeque
3 Java Streams and Lambda Expressions
3-1 Lambda Expressions
3-1 1 Lambda Syntax
3-1 2 Functional Interfaces
3-1 3 Method References
3-2 Streams
3-2 1 Stream Creation
3-2 2 Intermediate Operations
3-2 3 Terminal Operations
3-2 4 Parallel Streams
4 Java Concurrency
4-1 Threads
4-1 1 Thread Creation
4-1 2 Thread States
4-1 3 Thread Synchronization
4-1 4 Thread Communication
4-2 Concurrency Utilities
4-2 1 Executor Framework
4-2 2 Concurrent Collections
4-2 3 Atomic Variables
4-2 4 Locks
5 Java IO and NIO
5-1 Input and Output Streams
5-1 1 Byte Streams
5-1 2 Character Streams
5-1 3 Buffered Streams
5-2 File IO
5-2 1 File Class
5-2 2 FileReader and FileWriter
5-2 3 FileInputStream and FileOutputStream
5-3 NIO (New IO)
5-3 1 Path Interface
5-3 2 Files Class
5-3 3 Channels and Buffers
5-3 4 Asynchronous IO
6 Java Date and Time API
6-1 Date and Time Classes
6-1 1 LocalDate
6-1 2 LocalTime
6-1 3 LocalDateTime
6-1 4 ZonedDateTime
6-2 Period and Duration
6-2 1 Period Class
6-2 2 Duration Class
6-3 Time Zones and Calendars
6-3 1 TimeZone Class
6-3 2 Calendar Class
7 Java Modules
7-1 Module System Overview
7-1 1 Module Declaration
7-1 2 Module Path
7-1 3 Module Dependencies
7-2 Module Resolution
7-2 1 Automatic Modules
7-2 2 Named Modules
7-2 3 Unnamed Modules
7-3 Module Services
7-3 1 Service Provider Interface (SPI)
7-3 2 ServiceLoader Class
8 Java Security
8-1 Security Basics
8-1 1 Security Manager
8-1 2 Permissions
8-1 3 Policy Files
8-2 Cryptography
8-2 1 Key Generation
8-2 2 Encryption and Decryption
8-2 3 Digital Signatures
8-3 Secure Coding Practices
8-3 1 Input Validation
8-3 2 Secure Communication
8-3 3 Authentication and Authorization
9 Java Networking
9-1 Networking Basics
9-1 1 InetAddress Class
9-1 2 URL and URLConnection Classes
9-2 Sockets
9-2 1 Socket Class
9-2 2 ServerSocket Class
9-2 3 DatagramSocket Class
9-3 Networking Protocols
9-3 1 TCPIP
9-3 2 UDP
9-3 3 HTTP
10 Java Database Connectivity (JDBC)
10-1 JDBC Basics
10-1 1 JDBC Architecture
10-1 2 JDBC Drivers
10-1 3 Establishing a Connection
10-2 Executing SQL Statements
10-2 1 Statement Interface
10-2 2 PreparedStatement Interface
10-2 3 CallableStatement Interface
10-3 ResultSet
10-3 1 ResultSet Interface
10-3 2 ResultSetMetaData Interface
10-4 Transaction Management
10-4 1 Commit and Rollback
10-4 2 Savepoints
11 Java Annotations
11-1 Annotation Basics
11-1 1 Annotation Types
11-1 2 Meta-Annotations
11-1 3 Annotation Processing
11-2 Standard Annotations
11-2 1 @Override
11-2 2 @Deprecated
11-2 3 @SuppressWarnings
11-3 Custom Annotations
11-3 1 Annotation Creation
11-3 2 Annotation Usage
12 Java Reflection
12-1 Reflection Basics
12-1 1 Class Class
12-1 2 Field Class
12-1 3 Method Class
12-2 Dynamic Class Loading
12-2 1 ClassLoader Class
12-2 2 Dynamic Proxy
12-3 Reflection API
12-3 1 Accessing Class Members
12-3 2 Modifying Class Members
13 Java Internationalization (I18N)
13-1 I18N Basics
13-1 1 Locale Class
13-1 2 ResourceBundle Class
13-2 Formatting
13-2 1 NumberFormat Class
13-2 2 DateFormat Class
13-2 3 MessageFormat Class
13-3 Character Encoding
13-3 1 Charset Class
13-3 2 String Encoding and Decoding
14 Java Platform Module System (JPMS)
14-1 Module System Overview
14-1 1 Module Declaration
14-1 2 Module Path
14-1 3 Module Dependencies
14-2 Module Resolution
14-2 1 Automatic Modules
14-2 2 Named Modules
14-2 3 Unnamed Modules
14-3 Module Services
14-3 1 Service Provider Interface (SPI)
14-3 2 ServiceLoader Class
15 Java 11 New Features
15-1 New String Methods
15-1 1 isBlank()
15-1 2 lines()
15-1 3 repeat()
15-2 New File Methods
15-2 1 writeString()
15-2 2 readString()
15-3 Local-Variable Syntax for Lambda Parameters
15-3 1 var Keyword in Lambda Expressions
15-4 HTTP Client API
15-4 1 HttpClient Class
15-4 2 HttpRequest Class
15-4 3 HttpResponse Class
15-5 Nest-Based Access Control
15-5 1 Nest Host and Nest Members
15-5 2 Nest Access Control
15-6 Epsilon Garbage Collector
15-6 1 Epsilon GC Overview
15-6 2 Epsilon GC Use Cases
15-7 Flight Recorder
15-7 1 Flight Recorder Overview
15-7 2 Flight Recorder Use Cases
15-8 Application Class-Data Sharing (CDS)
15-8 1 CDS Overview
15-8 2 CDS Use Cases
15-9 Deprecations and Removals
15-9 1 Deprecated Features
15-9 2 Removed Features
15.9.2 Removed Features Explained

15.9.2 Removed Features Explained

Java SE 11 introduced several changes, including the removal of certain features that were deprecated in previous versions. Understanding these removed features is crucial for developers to ensure compatibility and to write modern, efficient Java code.

Key Concepts

1. Removal of Java EE and CORBA Modules

Java SE 11 removed the Java EE (Enterprise Edition) and CORBA (Common Object Request Broker Architecture) modules. These modules were previously included in the JDK but were moved to separate projects to streamline the core JDK.

Example

If your application relied on Java EE modules like JAX-WS (Java API for XML Web Services), you would need to include these dependencies separately. For example:

        <dependency>
            <groupId>javax.xml.ws</groupId>
            <artifactId>jaxws-api</artifactId>
            <version>2.3.1</version>
        </dependency>
    

2. Removal of JavaFX

JavaFX, which was previously part of the JDK, was also removed in Java SE 11. JavaFX is now a separate project and needs to be included as an external dependency if your application requires it.

Example

To use JavaFX in your project, you would need to add the following dependencies:

        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>11</version>
        </dependency>
    

3. Removal of Java Web Start

Java Web Start, a technology used to launch Java applications over a network, was removed in Java SE 11. Developers need to explore alternative deployment methods for their applications.

Example

Instead of using Java Web Start, consider using native installers or container-based deployment solutions like Docker.

4. Removal of Nashorn JavaScript Engine

The Nashorn JavaScript engine, which was introduced in Java 8, was removed in Java SE 11. Developers who relied on Nashorn for JavaScript execution need to use alternative engines like GraalVM.

Example

To use GraalVM for JavaScript execution, you would include it as a dependency:

        <dependency>
            <groupId>org.graalvm.js</groupId>
            <artifactId>js</artifactId>
            <version>20.3.0</version>
        </dependency>
    

Examples and Analogies

Think of the removal of these features as a house cleaning process. Just as you would remove old, unused items from your home to make space for new ones, Java SE 11 removed deprecated features to streamline the JDK and encourage the use of modern, efficient alternatives.

For instance, if you were using Java Web Start to deploy your application, it would be like relying on an old, outdated delivery method. Moving to a native installer or container-based deployment is akin to adopting a more efficient, modern delivery system.

By understanding and adapting to these changes, you can ensure that your Java applications remain compatible with the latest JDK versions and take advantage of modern, efficient tools and technologies.