Java Tutorial: Polymorphism in Interfaces

Java Interfaces Polymorphism: In this video we will understand how polymorphism works and why we need a concept like polymorphism in Java!

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Java Tutorial: Polymorphism in Interfaces
Tyrique  Littel

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Samanta  Moore

Samanta Moore

1620458875

Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

Samanta  Moore

Samanta Moore

1621096440

Functions for Strings in Java

In this tutorial, you will learn how to make better use of built-in functions for Strings in Java to program more quickly, effectively, and aesthetically.

What Is a String?

Firstly, of course, we have to initialize our string. What is a string used for?

  • You want to look at your string as a line, not as a mass of symbols.
  • If you have a long text, you want to work with the words, not the letters.
  • If you have lots of information, you need functions that solve questions as quickly as possible.

#java #tutorial #java strings #java tutorial for beginners #java string #string tutorial

Samanta  Moore

Samanta Moore

1621118940

How to Convert ODT Files to PDF in Java

Convert Office Open Document Text File (ODT) to standard PDF, DOCX, PNG, and JPG using Java.

Microsoft has maintained its position in the spotlight for formatted document creation and editing for good reason. Its extreme ease of use and lack of a learning curve has transformed the Microsoft Office Suite into a household name for most computer users in the United States as well as globally. This is propagated further through its almost ubiquitous use in education, as students are raised and taught using these applications.

The issue that arises with these programs, however, is their operation costs. For Apple and other non-Windows-based Operating Systems, the purchasing fees for Office can be steep. This, then, creates a paywall separating potential users from programs to which they are already accustomed. As an answer this problem, Microsoft created the OpenOffice application, which is a free, opensource version of the classic Office Suite. Within this application, you can perform almost all of the same functions as Office Suite, including creating text documents like one would with Microsoft Word. These text documents can be made using OpenOffice Writer, and are formatted using the .ODT file type. While this file type can be opened and saved using OpenOffice Writer and Word, in order to convert the file to a different format such as PDF you will need to run it through a conversion process.

The following APIs will allow you to convert your ODT documents to PDF, DOCX, PNG, and JPG for use in whatever way you need. The goal of this tutorial is to provide a simple and efficient means for instantly converting your ODT files without needing to find or download any extraneous programming.

#java #tutorial #api #pdf #java api #pdf converter #api access keys #api tutorial #java api tutorials #java apis

Samanta  Moore

Samanta Moore

1624974840

Functional Interfaces in Java 8

Introduction

Functional interface is an interface that consists of one abstract method. These interface can show only one functionality. Beyond Java 8, _lambda expressions _can be used to represent the instance of a functional interface. Functional Interfaces can contain any number of default methods. ConsumerPredicate, Function, Unary Operator, Binary Operator are some of the examples of predefined functional interfaces.

Points to remember which are allowed and which are not allowed in a functional interface:

  • In any functional interface, single abstract method is allowed.
  • In a functional interface, more than one abstract method cannot exist.
  • We can have more than one abstract method if we remove @FunctionalInterface  annotation, but that interface cannot be functional interface.

From functional interface if we remove @FunctionalInterface annotation, it must be valid. We use an annotation so that only single abstract method can be present. In functional interface we can provide implementations as the default methods inside interface.

#functional programming #java #java #java 8 #functional interfaces #functional interfaces in java 8