Java 10 New Features

|

Java SE 10 was released in March 2018.

The full list of new features in JDK 10 can be found here:
http://openjdk.java.net/projects/jdk/10/

In this tutorial, we will look at some of these new features and examine some of them.

1. JEP 286: Local-Variable Type Inference

To decrease the boilerplate coding, Java 10 introduces local-variable type inference feature.

With this feature it is not mandatory explicitly declaring the type of a local variable. Instead, the compiler infers the type of the expression.

Without JEP 286: 

List<String> list = new ArrayList<>();
Stream<String> stream = list.stream();

With JEP 286:

var list = new ArrayList<String>();
var stream = list.stream();

2. JEP 307: Parallel Full GC For G1

The G1 garbage collector was made the default in JDK 9. However it uses a single threaded mark-sweep-compact algorithm. With Java 10, G1 now does full GC in parallel.

The number of threads used during parallel phases of the garbage collectors can be set via -XX:ParallelGCThreads.

3. JEP 310: Application Class-Data Sharing

Class-Data Sharing, introduced in JDK 5, allows a set of classes to be pre-processed into a shared archive file that can then be memory-mapped at runtime to reduce startup time. 

Currently CDS only allows the bootstrap class loader to load archived classes. Application CDS ("AppCDS") extends CDS to allow the built-in system class loader (a.k.a., the "app class loader"), the built-in platform class loader, and custom class loaders to load archived classes.

Here is a good article about how to do that: Application CDS

References:
http://openjdk.java.net/jeps/310

4. JEP 314: Additional Unicode Language-Tag Extensions

http://openjdk.java.net/jeps/314

5. JEP 317: Experimental Java-Based JIT Compiler

The GraalVM compiler became available as an experimental JIT compiler.

Graal, a Java-based JIT compiler, is the basis of the experimental Ahead-of-Time (AOT) compiler introduced in JDK 9.

To enable Graal as the JIT compiler, use the following options on the java command line:

-XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler

6. JEP 319: Root Certificates

With this JEP, Java 10 provides a default set of root Certification Authority (CA) certificates in the JDK.

7. Container Support




Popular

Java 14 New Features

|
Java SE 14 was released in March 2020. The full list of new features in JDK 14 can be found here: https://openjdk.org/projects/jdk/14/   In this tutorial, we will look over some of these new features and examine some of them. 1. JEP 305: Pattern Matching for instanceof (Preview) With this JEP, instanceof now allows casting of the checked object to a variable. Before Java 14: if (obj instanceof String) { String s = (String) obj; // use s } With Java 14: if (obj instanceof String s) { // can use s here } else { // can't use s here } 2. JEP 345: NUMA-Aware Memory Allocation for G1 This JEP i mproves G1 performance on large machines by implementing NUMA-aware( non-uniform memory access ) memory allocation. Use the  +XX:+UseNUMA option to enable it. 3. JEP 358: Helpful NullPointerExceptions This JEP  improves the usability of  NullPointerException  generated by the JVM by describing precisely which variable was  null . Let's look over the following code which throw
Devamı

Pretenders, Contenders and Liars

|
Life is a way to the uncertainity. This is an exact fact. In this uncertain journey, we meet kinds of people of having different behaviours, and generally label them according to their behaviours. In this writing, i will try to write my understanding of three of these labels; pretenders, contenders and liars. Pretenders A pretender is a kind of people who pretends :) It does not do what it seems to do. It does what it does not seem to do. We frequently meet pretenders in our daily life. And if we catch a person pretending, then we feel that is not sincere. Okay, then here is a question sincerely to ask yourself; do you ever find yourself pretending ? Contenders A contender is a person who has a goal to reach and do not hesitate to fight for that goal. So a contender is sincere ? Absolutely yes, you may be completely opposite to a contender, but if you know that it's a contender, then you know that it's sincere in its behaviours. And sure it is, if you trus
Devamı

Java 12 New Features

|
Java SE 12 was released in March 2019. The full list of new features in JDK 12 can be found here: https://openjdk.org/projects/jdk/12/   In this tutorial, we will look at some of these new features and examine some of them. 1. JEP 189:  Shenandoah: A Low-Pause-Time Garbage Collector (Experimental) Shenandoah is a new garbage collection (GC) algorithm which reduces GC pause times,  independent of heap size. This GC algorithm is experimental so in order to use it with Java 12, you have to enable it : -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC 2. JEP 325:  Switch Expressions (Preview) This JEP extends the switch statement to be used as either a statement or an expression. Meaning that we can now return a value from a switch expression. Before Java 12, we can return a value by assigning it to a variable: String getColor(int num) { String result = ""; switch (number) { case 1, 2, 3: result = "red, green or blue"; break;
Devamı