Programming with Java 8

As one of the most popular programming languages, Java has evolved a lot over the last ten years, with Java 8 being the most awaited updated ever. Published in 2016, its changes ensure that as a whole, the Java ecosystem stays the top priority for developers who work on creating and maintaining enterprise-level dynamic applications. The Java Virtual Machine (JVM) also received its fair share of changes and updates.

With new libraries, updates, software launches, and so much more getting published day after day, technology is evolving faster than ever before. There is so much to work on and so many technologies and programming languages to try that every curious developer on the planet can’t decide what to focus on. If anything, they are all up to date with new releases and announcements, which is what their job positions often require! To support the rise of developers, a Zeqr professional is offering a special Java 8 programming class open to everyone online!

The Internet is also packed with good reception on the latest in technology with new articles, videos, and free and paid courses being published in a matter of days after something gets launched.

Java is a very versatile language for creating pretty much any type of application imaginable, and we’re talking about one of the widest ranges of possibilities. With tons of updates in the Java 8 release, it’s pretty obvious that not everything is relevant for an average Java developer. But I’ve created a shortlist of some of the best new additions and improvements in Java 8. It’s not for complete beginners, though, but it should be a good read that’ll let you in on what’s new inside the Java ecosystem.

Without further adieu, here are additions you should watch out for:

Lambda expressions

Without a doubt, lambda expressions are the biggest features Java 8 brings to life. Believe it or not, this functional programming paradigm was something Java never supported, but its inclusion now will surely help Java developers improve themselves the right way.

If you’ve never heard of this concept, you should know that a lambda expression basically represents an anonymous function that’s good for light syntax code. If you’re writing a function that should be used only once, then a lambda expression is what you’re looking for. It makes your code cleaner while improving readability.

So here’s a good, yet simple example that’s a good basis:

(String s1, String s2, String s3) -> { return s2.length() — s3.length() + s1.length(); }

Lambda expressions are unfortunately very tricky to understand.

Streams

Don’t confuse this with InputStream and OutputStream, because it’s much different. The Stream interface belongs in java.util.Stream and is good for parallel operation.

This interface has different types of stream operations, such as Filter, Sorted, Match, Map, Count, Reduce, and so on. Here’s an example of a sorted function using the Stream interface:

List<String> Str = new ArrayList<>();

Str.add(“abc1”);

Str.add(“aaa1”);

Str

.stream()

.sorted()

.filter((s) -> s.startsWith(“a”))

.forEach(System.out::println);

Output: “aaa1”, “abc1”

Maps

The new change to Maps includes support for task methods, such as removing keys, merging entries, and so much more. Merging entries is as simple as the following block of code:

map.merge(15, “fifteen”, (old, newVal) -> old.contact(newVal));

map.get(15);

Output: fifteen

map.merge(15, “merge”, (old, newVal) -> old.concat(newVal));

map.get(15);

Output: fifteenmerge

Date APIs

With a long awaited inclusion of the Date API, everything now works out of the box. The Date API is available under the java.time package.

Here is Date API in action:

//getting local time of Brazil East zone.

LocalTime loc1 = LocalTime.now(ZoneId.of(“Brazil.East”));

// getting clock time from the machine using default time zone.

Clock clock = Clock.systemDefaultZone();

Annotations

With Java 8, there is a possibility to include repeatable annotations. With repeatable annotations, you can use the @Repetable annotation for your already written annotations. This is good for backward-compatibility.

@interface Power {

Power[] value();

}

@Repeatable(Power.class)

@interface Power {

String value();

}

Other changes

Some other important changes to Java that Java 8 brough that you should know are:

● Concurrent Accumulators
● JDBC 4.2
● JavaFX changes
● JavaDoc tool now supports new DocTree API
● Improvement in Concurrency handling.