How Project Amber Will Revolutionize Java –

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July 18, 2019

How Project Amber Will Revolutionize Java –

An introduction to Project Amber – Project Amber is a recent step from the developers of java and OpenJDK, which aims to deliver few essential changes to the JDK (Java Development Kit) to ease the development process. This project is likely to improve productivity for java developers by making the code easier to write and maintain. The primary feature of this project is to make the complex codes simpler as well as readable. It will help java developers to easily maintain the codes. Project Amber includes the feature that lets the java programmer write shorter, polished and easy to understand codes. This project has been ongoing since 2017 and has already delivered some changes into java 10 and 11.

What has already been delivered?

  1. Local Variable Type Inference –

The introduction of Diamond Operator facilitates java programmers with the most awaited feature that asks to not write generic information multiple times in the same statement at the time of defining variables.

Example: List<String> Strings = new ArrayList<>();

Now we don’t need to write String inside angle brackets as we used to do earlier till java 6.

You can also declare and initialize local variables with keyword var. This was added to JDK in java 10.

Example:  var a = 10;

  1. Local Variable Type Inference for Lambdas –

In java 10, we could define lambda functions in either of the two ways:

By explicitly declaring the types or by completely eliminating the types.

Example:

  1. stream()
  2. .filter(String name -> name.length() > 10)
  3. .map(name -> name.toLowerCase());

Here in the second line, an explicit type declaration “String” has been made whereas in third line there’s no use of type.

But now in java 11, you can use “Var” type instead.

So we can write the same piece of code as:

  1. stream()
  2. .filter(var name -> name.length() > 10)
  3. .map(var name -> name.toLowerCase());

Upcoming Updates of Project Amber –

  1. Switch Expressions:

At present, the switch statement of java functions very similar to the switch expression of C or C++. However, JEP-325 brings support for simplifying the functionality of switch statements. These changes are very similar to “when” statement in Kotlin or “match” statement in Scala. With these changes, the syntax of the switch statement seems to be very similar to that of Lambdas.

Example:  switch (month) {

Case FEBRUARY -> System.out.println(28);

Case APRIL -> System.out.println(30);

Case JUNE -> System.out.println(30);

Case SEPTEMBER -> System.out.println(30);

Case NOVEMBER -> System.out.println(30);

default -> System.out.println(31);

}

There are some key points that are necessary to keep in mind while implementing the new writing style of switch statements.

  • The break keyword is not needed; neither can we use it over here.
  • The right-hand side of the arrow should always be an expression, a block or a throws statement. Anything else would cause an error.
  1. Raw String Literals:

Currently, Java has only one way to declare a string literal that is by enclosing the content in double quotes. However, JEP-326 launches a new string literal type names as Raw String Literals.  By using this feature, we can enclose the content within backtick marks instead of double quotes.

  1. Pattern Matching:

Currently, when we compare types in java, we have to use an instance of the operator to check if the value is of the right type, and after that, we require to cast the value to the correct type.

Example: if (obj instanceof String) {

String x = (String) obj;

// use x

}

This is what we used to do earlier, but now we can write a single statement instead of these two lines.

Example: if (obj instanceof x) {

// use x

}

  1. Concise Method Bodies:

JEP Draft 8209434 is an initiative to support elimination of complexities from method definitions just like lambda definitions work. At present, we define a lambda in three particular ways –

With a body – ToIntFunction<String> lenFn = (String s) -> { return s.length() ; } ;

As a single expression – ToIntFunction<String> lenFn = (String s) -> s.length() ;

As method reference – ToIntFunction<String> lenFn = String :: length;

However this proposal will help to keep certain methods much simpler than they actually are, for example: String getname() -> name; or

Int length(String s) = String ::length

Conclusion:

The Project Amber has introduced to reduce the complexities of java programming, some features have already been updated but few are still in the queue. We have covered most of the features and will share many more as soon as they are launched.

Author Bio:

Casey is a tech geek and has been working at a reputed firm as a java assignment help expert at My Assignment Services.He has been writing blogs on java for more than six years and also provides assignment help to IT students.

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