stijnbeelen/java9up

JAVA 9 UP

Repository with new features of Java 9, 10, 11, 12 & 13.

Java 9

Features:

• new HttpClient & HttpRequest
• Process API improvements
• Killing Processes
• Private interface methods
• Collection factory methods
• optional class improvements
  • .stream()
  • .ifPresentOrElse()
  • .or()
• anonymous diamond operators
• stream API improvements see here
  • takeWhile()
  • dropWhile()
  • iterate()
  • ofNullable()
• completable future API improvements
  • delays & timeouts
  • subclassing
  • new factory methods
• improved javadoc
• improved @Deprecated
• Modules
• REPL
• Multi release JAR's
• Garbage collector
• try with resources improvement

Java 10

Features:

• Local variable type inference
  • var (compiler infers the type of message from the type of the initializer present on the right-hand side)
  • var is not a keyword
  • no runtime overhead
• Unmodifiable collections
  • List.copyOf()
  • Set.copyOf()
  • Stream.toUnmodifiable()
• optional class improvements
  • .orElseThrow()
• performance improvements
• container awareness
  • -XX:-UseContainerSupport disables container awareness
  • -XX:ActiveProcessorCount=count specifies the number of CPU's the JVM will use
  • system memory control
    • -XX:InitialRAMPercentage
    • -XX:MaxRAMPercentage
    • -XX:MinRAMPercentage
• Time-based Release Versioning
  • 1 release each 6 months
  • feature release support will only last 6 months
  • LTS release will be supported for 3 years
• Graal
  • -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler

Java 11

Features:

• launching single-file source-code programs
• local variable lambda parameters
• String API additions
• Nest based access control ???
• Http client updates
• Epsilon GC
• jlink
• Predicate.not()

Sources:

• Baeldung

Java 12

Features:

• String API additions
• Switch preview
• Number formatting
• Collectors.teeing()

Java 13

• Text Block Preview
• Switch preview