5 Essential Features Every Java Developer should learn in 2022

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Java Programming language is changing rapidly. Now there is a new release every six months and it’s hard to keep up-to-speed with new Java features.

So what should a Java programmer do to keep himself up-to-date and without missing key features? Well, instead of learning all-new feature you can focus on some of the key Java features which can make Java development easier and has the potential to improve code quality and developer productivity.

In this article, you will learn about 5 new Java features since Java 9 release

These are the Java features that will not only help you to write better code but also be worth knowing from a Java interview point of view and that’s why I think every Java developer should learn in 2022.

Modules made your Java application smaller and faster by reducing unwanted packages. You are allowed to include what you really need. Then var comes which makes it easier to declare local variables like Javascript and other programming languages.

Switch expression made the branching easier and improve the readability aspect of code. You can now write expressions, combine multiple cases to produce a single result, and much more. You will see in the example how clear and concise new switch statements are.

Sames goes to Text Block which ended the pain of escaping string for multiple lines. Now, it’s much easier to produce multiple line output from a Java program.

5 New Java Features Every Java Developer should learn in 2022

Java is one of the most popular programming languages. It has maintained itself as one of the top languages since its inception in the 90s.

 

Java developers must keep up with the new changes.

In this article, we will discuss the top 5 new Java features and two old but important Java features to learn, as shown below:

 

  1. Module

Java module is a new feature added with Java 9. It is a mechanism, using which you can package a Java app or API as a Java module. It is available as a modular JAR file. A module can contain one or more packages.

 

This feature allowed the Java designer to split the big JDK into smaller modules which means now your application has a much lower memory footprint and you can run on devices with lower memory.

Before setting up a module, we need to put “module-info.java” at the root of the packages.

Following is the syntax of creating a module.

module newModule{

// functional code

}

We have to use the “module” keyword to create a module.  If you want to learn more about Modules in Java, I suggest you check out The Complete Java Masterclass course from JNNC Technologies.

 

  1. Record

Record in Java is a special kind of class that has a concise syntax. It is used for defining immutable data-only classes. Moreover, the Java record class is useful for holding records returned from a remote service call and database query, records read from CSV files, and for similar other use cases.

Following is the syntax of the Java record class.

public record demo(int arg1, int arg2){

//functional code

}

 

Record is a seriously useful feature, it’s not just saves typing but also provides a robust mechanism to declare immutable data structure. I highly recommend you to use Record if your object just has a bunch of fields to manage the state.

  1. var keyword

Introduced in Java 10, the var keyword is one of the most useful new features of Java. Earlier in Java, while declaring a variable, we had to specify the data type of the variable. Such a variable can hold only those values that match the data type. But variables declared using the var keyword can hold the value of any data type. There is no need to specify the data type.

class VarDemo {

 

public static void main (String[] args) throws java.lang.Exception {

 

// int

var x = 123;

 

// double

var y = 2.70;

 

// string

var z = ‘abc’;

 

}

}

In the above code, three variables – x, y, and z are declared using the var keyword. We can see there is no data type specified. If you want to learn more about var and other Java 10 and 11 features, I recommend you to check out this nice little course Java New Features (Java 12, Java 11, Java 10, Java9 & Java8) on JNNC Technologies

 

  1. Text block

Text block is another useful new feature of Java. A multi-line string is a block of text, that spans across multiple lines. We have to use the line separator for this.

In Java, “/n” is the line separator. Observe the below code.

class TextBlockDemo {

 

public static void main (String[] args) throws java.lang.Exception {

String multiLine = “This is line 1.\nThis is line 2.\nThis is line 3.”;

System.out.println(multiLine);

}

 

}

 

 

The output will be:

This is line 1.

This is line 2.

This is line 3.

If you want to learn more about Java 13 features, I recommend you to check out the What’s New in Java 13 course on Pluralsight.

  1. Sealed classes

The sealed class feature will give us more control over inheritance in Java. In simple words, we can now define which classes can implement or extend a class or interface.

Following is an example of a sealed class in Java.

public abstract sealed class C permits A, B {

// functional code

}

The above class is sealed using the “sealed” keyword. Then, the “permits” keyword is used to permit those classes which can extend or implement it.

Similarly, we can also seal an interface.

public sealed interface I permits J, K {

// functional code

}

If you want to learn more about Sealed Classes, Records, and Text Block then I suggest you join the What’s New in Java 15 course by Sander Mak on Pluralsight. It provides a nice summary and demo of these new Java features.

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