How To Migrate From Java 8 to Java 17 Core Java java Java 17 Java 8 by devs5003 - December 11, 2024December 18, 20240 From Java 8 to Java 17, there have been several improvements in the Java coding. However, Java 17 has been released on September 21, 2021, but there are several projects in the industry which are yet to be upgraded. Undoubtedly, it's not that much easy task for the big applications where in there are billions of lines of code. In this article, we will discuss about 'How to migrate from Java 8 to Java 17' & higher versions, especially the upgradation in source code. We will also explore the new features till Java 17 in comparison to Java 8 or earlier versions. Each feature will be demonstrated with an example in Java 8, followed by its equivalent implementation in Java 17. Some
Optional Class in Java 8 – A Comprehensive Tutorial Core Java java Java 8 by devs5003 - October 16, 2024December 17, 20240 Java 8 introduced many significant features, one of which is the Optional class. It was intended to address the common problem of dealing with null values in Java. Many people in the industry feel that you are not a real Java programmer until you haven't come across a NullPointerException. Since NullPointerException indicates the absence of a value, the null reference is the source of many problems. So, Optional class can address some of these problems. In this article, we will explore the Optional Class in Java 8, its benefits, usage, and best practices to ensure efficient and null-safe code. What is Optional Class in Java? The Optional is a class of the 'java.util' package. In simple words, Optional is a single-value container/wrapper that
Default Method in Interface Java 8 Core Java java by devs5003 - August 27, 2024August 29, 20240 As we are aware that till JDK 7 we couldn't include implemented method inside an interface. In other words, there was no provision to have a method body inside a method of an Interface. But for those who are reading Default Methods for the first time it will be very surprising. The surprise is that we can now include an implemented method inside an Interface. Therefore, we can also have an implemented method inside an interface. Here, we are talking about default method in interface. The most use of default method in interface is to provide additional functionality to a given type without breaking down the existing implemented classes. In this article, we are going to take a deeper look on
Static Methods In Interface Java 8 Core Java java by devs5003 - August 26, 2024August 29, 20242 Before learning the Static Methods in Interface let's go back to JDK 7 and older versions, and memorize the scope of a static method. We will come to a conclusion that Static Methods could be defined in a class, abstract class, final class but not in an interface. However, from JDK 8 onward, we can define Static Methods in Interface as well. Now you might have one question 'What is the need of defining Static methods in Interface?'. Wait for a couple of minutes, you will get to know each & every concept behind it. In this article we will have a closer look on the 'Static Methods in Interface'. Furthermore, we will also talk about main() method as the main()
How To Sort the List in Java 8 Core Java Interview java Java 8 by devs5003 - July 14, 2024November 24, 20240 During project development, every developer come across a situation where implementation of sorting becomes mandatory. There are many flavors of sorting. It depends on the scenario which one to implement where. In this article, we have mainly focused on sorting using Java 8. Moreover, we have also provided an example which was being used before the introduction of Java 8. Hence our article is on 'How To Sort the List in Java 8'. Sorting a list using Java 8 can be more performant due to the introduction of the Java Stream API and lambda expressions, which enable more efficient sorting operations. There are multiple ways to sort a list of items already available before Java 8. Further, Java 8 has introduced different
Method Reference in Java 8 [::] Java 8 Core Java java by devs5003 - March 20, 2024March 21, 20243 Method Reference is a wonderful feature introduced in Java 8. Apart from taking advantage of functional programming, one of the biggest advantages in using a Lambda expression is to minimize the lines of code. Similarly, Method Reference in Java 8 [::] also minimizes lines of code even more than Lambda. However, we use both of them in the presence of functional interfaces only. Moreover, It is also a concise and simpler form of lambda expression. In this article, we will also learn how to change a Lambda expression into a method reference. Let's start discussing about 'Method Reference in Java 8 [::]' and it's related concepts.​ What is Method Reference(::)? As we have seen in Lambda expression topic that we use lambda
How to Sort List by Date in Java 8 ? java Core Java Java 8 by devs5003 - January 24, 2024July 16, 20240 Sorting a List by Date sometimes becomes a bit tricky. One of the tricky part is how to handle date format and then perform the sorting. In this article 'How to Sort List by Date in Java 8 ?', we will discuss sorting of three types of Dates. These are java.util.Date, java.time.LocalDate and java.time.LocalDateTime. Further, in order to sort the list, we will use three approaches. Using these approaches, we will utilize the new concepts introduced in Java 8. Moreover, these concepts are Lambda Expressions, Method References and Stream API. Additionally, if you want to know how to sort a general list in Java 8, we have separate article on 'How To Sort the List In Java 8?'. Here we will
Java 8 Features Java 8 Core Java java by devs5003 - August 20, 2023October 16, 20243 Java 8 was released by Oracle after 2 Years 7 Months 18 Days of release of java 7 on March 18th, 2014. However, after Java 1.5 version, Java 8 is the next major release version. Before Java 8, Sun community focused majorly on objects, but in Java 8 version, Oracle community has focused more on functional programming to bring its benefits to the Java language. However, it doesn’t mean that Java is a functional oriented programming language, but we should grasp it in a way that we can apply functional aspects of programming as well now with Java 8. It is a part of Java 8, as an object oriented programming. Here, we will discuss new Java 8 Features one by
Predefined Functional Interfaces Java 8 Core Java java by devs5003 - March 16, 2023March 1, 20240 I would consider that we have a clear understating of Functional Interfaces from the Topic "The Functional Interfaces in Java 8". We have also covered other topics related to it like Why it is introduced, its benefits & when to use it. However, some commonly used Predefined Functional Interfaces are listed in the attached table. Moreover, we will discuss all of them in detail in below sections. What are Predefined Functional Interfaces? Benefits of Using them? Java 8 has provided some Predefined (Built-in) Functional Interfaces to make our programming easier. Moreover, Predefined Functional Interfaces include most commonly used methods which are available to a programmer by default. In our day to day programming many times we come across re-occurring functionalities to be
Java Stream API Interview Questions Core Java java Java 8 Java MCQ MCQ Stream API by devs5003 - February 25, 2023May 31, 20240 If you are a java developer, you should have a solid understanding of Java 8 features, especially in the programming part. According to the observations of various corporate trainers in Java, developers comparatively take much time to understand the Java Stream API concepts. They also recommend that developers need much coding practice on Java Stream API concepts rather than going through theoretical concepts again & again. In this article, we will be doing coding practice in the form of MCQs that are frequently asked in the interviews. Undoubtedly, you must also get benefit in the interviews from these Java Stream API Interview Questions. So, whether you are a beginner or a professional, solve these Java Stream API Interview Questions to learn