This post aims to resume java 10 news.

The oracle release note is available here

API updates

var - Type inference

One of the most visible enhancements in JDK 10 is type inference of local variables with initializers. The compiler infers the type.

        String name = "Before Java 10" ;
        var name = "After Java 10" ;

Collections

• copyOf() for List, Set and Map
• toUnmodifiable() on Collectors
• Optional.orElseThrow() throws NoSuchElementException by default

Container Awareness

VMs are now aware of being run in a Docker container and some options have been added :

• XX:InitialRAMPercentage
• XX:MaxRAMPercentage
• XX:MinRAMPercentage

Performance

• Parallel Full GC for G1 to improve worst-case latencies.
• Application Class-Data Sharing to optimize startup time and memory footprint when multiple JVMs share the same archive file
• Experimental Java-Based JIT Compiler
• Easier SSL With OpenJDK

Links

• Overview by baeldung
• Performance by baeldung
• inference by baeldung