Seamus  Quitzon

Seamus Quitzon

1602993000

Functional Programming Techniques in Java with Examples

If you’re a Java developer, I’m sure that you have seen code similar to the featured image snippet above at least once. The code in the snippet above is an example of functional programming paradigm implementation in Java, which will filter and transform the

List<String> in the request to another List<String>.

In this article, I will write about how to write code using Java’s API for functional programming. In the end, we will write our own stream API so we can understand how to implement a functional programming style in Java.

Functional Programming in Java

Functional programming in Java has been around for a long time. When Oracle released Java 8 back in 2014, they introduced lambda expression, which was the core feature for functional programming in Java.

Let’s see an example of the difference between using a sequence of imperative statements and using a functional style in Java.

Imperative declaration code example:

Functional declaration code example:

As we can see, even though both pieces of code achieve the same result, the difference is significant. The imperative declaration code has many curly braces and is much longer, which makes it harder to read, compared to the functional style code.

#java #programming #android #software-development #functional-programming #coding #code-quality #beginners

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Functional Programming Techniques in Java with Examples
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

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

Samanta  Moore

Samanta Moore

1624948542

Lambda Expression in Java 8

In this blog we will understand what is the lambda expression and why we need lambda expression and how we use lambda and about the functional interface.

What is Lambda Expression :
  • It is an anonymous function.
  • Not having name
  • No return type and no modifiers.

#functional programming #java #functional java #java #java 8 #java8 #lambda expressions in java

Seamus  Quitzon

Seamus Quitzon

1602993000

Functional Programming Techniques in Java with Examples

If you’re a Java developer, I’m sure that you have seen code similar to the featured image snippet above at least once. The code in the snippet above is an example of functional programming paradigm implementation in Java, which will filter and transform the

List<String> in the request to another List<String>.

In this article, I will write about how to write code using Java’s API for functional programming. In the end, we will write our own stream API so we can understand how to implement a functional programming style in Java.

Functional Programming in Java

Functional programming in Java has been around for a long time. When Oracle released Java 8 back in 2014, they introduced lambda expression, which was the core feature for functional programming in Java.

Let’s see an example of the difference between using a sequence of imperative statements and using a functional style in Java.

Imperative declaration code example:

Functional declaration code example:

As we can see, even though both pieces of code achieve the same result, the difference is significant. The imperative declaration code has many curly braces and is much longer, which makes it harder to read, compared to the functional style code.

#java #programming #android #software-development #functional-programming #coding #code-quality #beginners

Introduction to JAVA COLLECTIONS

In this blog we will understand basics of JAVA Collections framework.

What are JAVA Collections and Why do we need them?

The Collection in Java is a framework that provides an architecture to store and manipulate the group of objects.

Collections are like containers that group multiple items in a single unit. For example, a jar of chocolates, a list of names, etc. Collections are used in every programming language and when Java arrived, it also came with few. Let’s see how does it help us:

  • Reduces programming effort
  • Increases program speed and quality
  • Allows interoperability among unrelated APIs
  • Reduces effort to learn and to use new APIs
  • Reduces effort to design new APIs
  • Fosters software reuse

#functional programming #java #collections #functional java #java #introduction to java collections