Macey  Legros

Macey Legros

1600270260

Java Vector Class Example | Vector Class In Java

Java Vector class is a part of the Java Collection framework. It is used to create arrays whose size can increase or decrease (that is, Dynamic Array) during the execution. The Java Vector class implements the List interface in the Java Collection framework. The main difference between the** Vector** class and other Collection classes is that the** Vector** class is synchronous, unlike others.

Java Vector Class

Vector class contains Legacy methods, unlike other Collection classes. Initially, Vector class was a Legacy class. It was added to the Collection framework later. The collection framework was not included in the early version of java. So, Legacy classes are used to store objects.

The hierarchy of the Vector class is shown in the diagram below.

#java #vector #java vector

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Java Vector Class Example | Vector Class In Java
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

Macey  Legros

Macey Legros

1600270260

Java Vector Class Example | Vector Class In Java

Java Vector class is a part of the Java Collection framework. It is used to create arrays whose size can increase or decrease (that is, Dynamic Array) during the execution. The Java Vector class implements the List interface in the Java Collection framework. The main difference between the** Vector** class and other Collection classes is that the** Vector** class is synchronous, unlike others.

Java Vector Class

Vector class contains Legacy methods, unlike other Collection classes. Initially, Vector class was a Legacy class. It was added to the Collection framework later. The collection framework was not included in the early version of java. So, Legacy classes are used to store objects.

The hierarchy of the Vector class is shown in the diagram below.

#java #vector #java vector

Samanta  Moore

Samanta Moore

1622466360

Vector in Java | Java Vector Class with Examples

In programming, one of the most commonly used data structures is Vector in Java. Arrays are static data structures that can linearly store data. Similarly, vector in java also store the data linearly, but they are not restricted to a fixed size. Instead, its size can grow or shrink as per requirement. The parent class is AbstractList class and is implemented on List Interface.

Before you start to use vectors, import it from the java.util.package as follow:

import java.util.Vector

Declaration and Assessing Elements of a Vector

Here is how a vector in java is declared:

public class Vector extends AbstractList

implements List, RandomAccess, Cloneable, Serializable

Here, V is the type of element which can be int, string, char, etc.

Like we access data members in arrays, we can do that in vectors, too, by using the element’s index. For example, the second element of Vector E can be accessed as E[2].

Some common errors made while declaring a vector in java:

  • An IllegalArgumentException is thrown if the initial size of the vector is a negative value
  • A NullPointerException is thrown if the specified collection is null
  • The size of the vector is less than or equal to the capacity of the vector
  • Capacity is doubled in every increment cycle if vector increment is not specified

#full stack development #java #vector #vector in java

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

Joseph  Murray

Joseph Murray

1624063200

Creating an Immutable Class in Java

In this article, we’ll define the typical steps for creating an immutable class in Java and then implement it.

Steps to create Immutable class in java

  1. Make your class final, so that no other classes can extend it.
  2. Make all fields private so that direct access is not allowed.
  3. Don’t provide “setter” methods — methods that modify fields or objects referred to by fields.
  4. Special attention when having mutable instance variables
  5. Inside the constructor, make sure to use a clone copy of the passed argument and never set your mutable field to the real instance passed through the constructor.
  6. Make sure to always return a clone copy of the field and never return the real object instance.

#java #class #objects #immutable #creating an immutable class in java #immutable class in java