The use of var doesn't come without its share of challenges, for both the developers of the Java language and its users. Let's start with the reasons why var has limited usage.
- 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
Challenges
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