The syntax to define a data class looks simple. However, both the syntax and semantics are important. Let's get started by looking at some examples, in the following sections.
- Title Page
- Copyright and Credits
- About Packt
- Contributors
- Preface
- Section 1: JDK 10
- Type Inference
- What is type inference?
- Type inference with var
- Compulsory non-null initialization
- Local variables
- Code check – part 1
- Using var with primitive data types
- Type inference with derived classes
- Type inference with interfaces
- Using var with arrays
- Type inference with generics
- Code check – part 2
- Passing inferred variables to a method
- Reassigning values to inferred variables
- Explicit casting with inferred variables
- Assigning null with explicit casting
- Type inference in previous versions of Java
- Challenges
- Type inference versus dynamic binding
- Summary
- AppCDS
- Garbage Collector Optimizations
- Miscellaneous Improvements in JDK 10
- Technical requirements
- Mapping JDK 10 features with scopes and JEPs
- Consolidating the JDK forest into a single repository
- Thread-local handshakes
- Removal of the Native-Header Generation Tool (javah)
- Additional Unicode language-tag extensions
- Heap allocation on alternative memory devices
- The experimental Java-based JIT compiler
- Root certificates
- Time-based release versioning
- Summary
- Section 2: JDK 11
- Local Variable Syntax for Lambda Parameters
- Epsilon GC
- The HTTP Client API
- ZGC
- Flight Recorder and Mission Control
- Miscellaneous Improvements in JDK 11
- Technical requirements
- Listing the JEPs that are used in this chapter
- Nest-based access control
- Dynamic class-file constants
- Improving AArch64 intrinsics
- Removing the Java EE and CORBA modules
- A key agreement with Curve25519 and Curve448
- Unicode 10
- ChaCha20 and Poly1305 cryptographic algorithms
- Launching single file source code programs
- TLS 1.3
- Deprecating the Nashorn JavaScript engine
- JEP 336 – deprecating the pack200 tools and API
- Summary
- Section 3: JDK 12
- Switch Expressions
- Technical requirements
- Issues with traditional switch constructs
- Using switch expressions
- Defining local variables in a switch branch
- Another syntax for switch expressions
- Comparing break with break <return value>
- A preview language feature
- Exhaustive cases
- What can a switch branch execute other than returning a value?
- How not to use labels and continue in switch expressions
- Summary
- Miscellaneous Improvements in JDK 12
- Section 4: Project Amber
- Enhanced Enums in Project Amber
- Data Classes and Their Usage
- An introduction to data classes
- Diving into data classes
- Example of syntax and semantics
- The aggregate and exploded forms of data classes
- Limitations
- Examples from the past – changes to define enums
- Pattern matching with data classes
- Encapsulating the state
- Abstract and non-abstract data classes
- Data classes and inheritance
- Extending an abstract data class
- Implementing interfaces
- Additional variables
- Overriding implicit behaviors
- Additional methods and constructors
- Mutability
- Summary
- Raw String Literals
- Lambda Leftovers
- Pattern Matching
- Other Books You May Enjoy
Diving into data classes
-
No Comment
..................Content has been hidden....................
You can't read the all page of ebook, please click here login for view all page.