Composite Design Pattern in Java

Here I am with another useful design pattern for you — the composite design pattern. I will try to point out the key features to remember while implementing the composite pattern for you.

Composite Design Pattern

The composite pattern is meant to “compose objects into a tree structure to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly”

• Composite design patterns describe groups of objects that can be treated in the same way as a single instance of the same object type.
• The composite pattern allows us to “compose” objects into tree structures to represent part-whole hierarchies.
• In addition, the composite patterns also allow our clients to treat individual objects and compositions in the same way.
• Composite patterns allow us to have a tree structure for each node that performs a task.
• In object-oriented programming, a composite is an object designed as a composition of one-or-more similar objects, all exhibiting similar functionality. This is known as a “has-a” relationship between objects.

#java #tutorial #design patterns #client #component #composite #composite design pattern

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Composite design pattern — Java

Composite Pattern tutorial

Definition of Composite pattern

In software engineering, the composite pattern is a partitioning design pattern. The composite pattern describes a group of objects that are treated the same way as a single instance of the same type of object. The intent of a composite is to “compose” objects into tree structures to represent part-whole hierarchies. Implementing the composite pattern lets clients treat individual objects and compositions uniformly.

Where to use the Composite pattern?

UML example

Implementation of the Composite pattern

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#design-patterns #java #code #composite-design-pattern #tutorial #composite design pattern — java

Builder Design Pattern

What is Builder Design Pattern ? Why we should care about it ?

Starting from **Creational Design Pattern, **so wikipedia says “creational design pattern are design pattern that deals with object creation mechanism, trying to create objects in manner that is suitable to the situation”.

The basic form of object creations could result in design problems and result in complex design problems, so to overcome this problem Creational Design Pattern somehow allows you to create the object.

Builder is one of the** Creational Design Pattern**.

When to consider the Builder Design Pattern ?

Builder is useful when you need to do lot of things to build an Object. Let’s imagine DOM (Document Object Model), so if we need to create the DOM, We could have to do lot of things, appending plenty of nodes and attaching attributes to them. We could also imagine about the huge XML Object creation where we will have to do lot of work to create the Object. A Factory is used basically when we could create the entire object in one shot.

As **Joshua Bloch (**He led the Design of the many library Java Collections Framework and many more) – “Builder Pattern is good choice when designing the class whose constructor or static factories would have more than handful of parameters”

#java #builder #builder pattern #creational design pattern #design pattern #factory pattern #java design pattern

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

Composite Design Pattern in Java

Here I am with another useful design pattern for you — the composite design pattern. I will try to point out the key features to remember while implementing the composite pattern for you.

Composite Design Pattern

The composite pattern is meant to “compose objects into a tree structure to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly”

• Composite design patterns describe groups of objects that can be treated in the same way as a single instance of the same object type.
• The composite pattern allows us to “compose” objects into tree structures to represent part-whole hierarchies.
• In addition, the composite patterns also allow our clients to treat individual objects and compositions in the same way.
• Composite patterns allow us to have a tree structure for each node that performs a task.
• In object-oriented programming, a composite is an object designed as a composition of one-or-more similar objects, all exhibiting similar functionality. This is known as a “has-a” relationship between objects.

#java #tutorial #design patterns #client #component #composite #composite design pattern

Factory design pattern — Java

Definition of the Factory pattern

In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating objects without having to specify the exact class of the object that will be created. This is done by creating objects by calling a _factory method _— either specified in an interface and implemented by child classes, or implemented in a base class and optionally overridden by derived classes — rather than by calling a constructor.

Where to use the Factory pattern

• When a class doesn’t know what sub-classes will be required to create
• When a class wants that its sub-classes specify the objects to be created.
• When the parent classes choose the creation of objects to its sub-classes.

#factory-design-pattern #code #tutorial #design-patterns #java #factory design pattern — java