Complete Tutorial for builders in Java (in simple language)

~ ltcbuzy ~ Leave a comment


In this tutorial, you will get acquainted with builders in Java; How to create and use builders with the help of examples.

What is a manufacturer?

The constructor is similar to the method (but not the method) that is called automatically when the object is created.

The Java compiler distinguishes between method and constructor using the name and type of recursive. In Java, the constructor has a class-like name and does not return any values.

class Test {

Test() {

// constructor body

}

}

Here, Test () is constructive. It has the same class name and no return type.

class Test {

void Test() {

// method body

}

}

Here, Test () has the same name as the class. However, its return type is void. Hence, it is not constructive but methodical.

Example: Builder in Java

  1. class ConsMain {
  2. private int x;
  3. // constructor
  4. private ConsMain(){
  5. System.out.println(“Constructor Called”);
  6. x = 5;
  7. }
  8. public static void main(String[] args){
  9. ConsMain obj = new ConsMain();
  10. System.out.println(“Value of x = ” + obj.x);
  11. }
  12. }

Output

Constructor Called

Value of x = 5

Here, the ConsMain () constructor is called when the obj object is created.

A constructor may or may not accept an argument.

Builder without arguments

If the Java constructor does not accept any parameters, the constructor is no-arg. Its structure is as follows:

accessModifier ClassName() {

// constructor body

}

Sample constructor without arguments

  1. class NoArgCtor {
  2. int i;
  3. // constructor with no parameter
  4. private NoArgCtor(){
  5. i = 5;
  6. System.out.println(“Object created and i = ” + i);
  7. }
  8. public static void main(String[] args) {
  9. NoArgCtor obj = new NoArgCtor();
  10. }
  11. }

Output

Object created and i = 5

Here, the NoArgCtor () constructor does not accept any parameters.

Did you notice that the creator of NoArgCtor () is private?

This is because the object is made from within the same class. Hence, it can access the manufacturer.

However, if the object is created outside of class, you must make access to that constructor public. For example:

  1. class Company {
  2. String domainName;
  3. // object is created in another class
  4. public Company(){
  5. domainName = “programiz.com”;
  6. }
  7. }
  8. public class CompanyImplementation {
  10. public static void main(String[] args) {
  11. Company companyObj = new Company();
  12. System.out.println(“Domain name = “+ companyObj.domainName);
  13. }
  14. }

Output

Domain name = targetedwebtraffic.com

Default builder

If you do not create the builder yourself, the Java compiler will automatically create a builder without arguments at runtime. This builder is known as the default builder. The default constructor initializes each of the informal sample variables.

Example: Default builder

  1. class DefaultConstructor {
  2. int a;
  3. boolean b;
  4. public static void main(String[] args) {
  5. DefaultConstructor obj = new DefaultConstructor();
  6. System.out.println(“a = ” + obj.a);
  7. System.out.println(“b = ” + obj.b);
  8. }
  9. }

The above program is equivalent to:

  1. class DefaultConstructor {
  2. int a;
  3. boolean b;
  4. private DefaultConstructor() {
  5. a = 0;
  6. b = false;
  7. }
  8. public static void main(String[] args) {
  9. DefaultConstructor obj = new DefaultConstructor();
  10. System.out.println(“a = ” + obj.a);
  11. System.out.println(“b = ” + obj.b);
  12. }
  13. }

Output

a = 0

b = false

Parametric constructor

A constructor may also accept parameters. Its structure is as follows:

accessModifier ClassName(arg1, arg2, …, argn) {

// constructor body

}

Example: Parametric constructor

  1. class Vehicle {
  2. int wheels;
  3. private Vehicle(int wheels){
  4. wheels = wheels;
  5. System.out.println(wheels + ” wheeler vehicle created.”);
  6. }
  7. public static void main(String[] args) {
  8. Vehicle v1 = new Vehicle(2);
  9. Vehicle v2 = new Vehicle(3);
  10. Vehicle v3 = new Vehicle(4);
  11. }
  12. }

Output

wheeler vehicle created.

wheeler vehicle created.

wheeler vehicle created.

Here, we passed an int (number of wheels) argument to the constructor when creating the object.

Overload builders in Java

Similar to method overloading, you can have two or more manufacturers with the same name with different parameters. For example:

  1. class Company {
  2. String domainName;
  3. public Company(){
  4. this.domainName = “default”;
  5. }
  6. public Company(String domainName){
  7. this.domainName = domainName;
  8. }
  9. public void getName(){
  10. System.out.println(this.domainName);
  11. }
  12. public static void main(String[] args) {
  13. Company defaultObj = new Company();
  14. Company programizObj = new Company(“programiz.com”);
  15. defaultObj.getName();
  16. programizObj.getName();
  17. }
  18. }

Output

important points

  • Immediately after calling the objects, the creators are called.
  • The two laws of creation are:
  • The Java constructor name must exactly match the class name.
  • A Java builder should not have a recursive type.
  • If it does not have a constructor class, the Java compiler automatically generates a default constructor at runtime. The default constructor initializes the sample variables with the default values. For example: the variable int is equal to 0.
  • Manufacturer types:
  • No-Arg Constructor – A constructor that accepts no arguments
  • Default Builder – A builder created automatically by a Java compiler. (If not explicitly defined)
  • Parameter constructor – Used to specify specific values ​​of variables in an object
  • Creators can not be abstract or static or final.
  • The constructor can be defined several times.

Sources:

https://levelupknowledge.w3spaces.com/index.html

Advertisement

Popular Teaching Methods And Tools 2022

~ ltcbuzy ~ 2 Comments

The spread of the corona virus in the world has caused many changes. The field of education was the first to be most influential; Schools, universities, and educational institutions were closed, and students, teachers, students, and faculty were forced to look for new ways to continue the education process. In this situation, technology came to our aid. Social networks , virtual classrooms and instructional videos have enabled many to continue their education. These technologies existed before the Corona epidemic, but their use was less common. These technologies have now become an important part of the teaching and learning process and will continue to influence this field in the future. In this article, we look at the future of technology in education. Stay with us until the end. Show study guide

What is the future of technology in education?

The application of technology in education is not limited to the period of the Corona epidemic. These technologies are rapidly changing teaching methods. The new generation is more inclined to receive education through these technologies. Of course, this does not mean eliminating traditional classrooms, and these technologies will complement classrooms.

In a survey of education activists, 75 percent predicted that digital devices such as tablets and e-books would replace paper textbooks in classrooms. Studies have also shown that virtual reality is one of the most attractive technologies that will soon open a place for itself in education. These examples show that the way of teaching will change completely. With the emergence and entry of various technologies in this field, the main challenge for teachers is to select and combine the most appropriate tools to advance the teaching process.

What are the necessary developments to educate the new generation?

The future of education and technology

Let’s take a look at the educational needs of the new generation and the changes that have taken place in the way learners learn. Education activists must read these items.

1. One-click access to educational content

The Internet has made it possible for billions of people to access data and educational content in a fraction of a second. As of 2017, more than 6.5 million people have been involved in e-learning.

Distance learning has its own challenges, but it also gives teachers the flexibility to be able to tailor their curriculum. Learners no longer need to attend classes. They can watch live or recorded class videos remotely. Teachers and educators must adapt to the new way of teaching.

2. Loss of temporal and spatial boundaries

One of the most important features of future education is the elimination of temporal and spatial constraints. Today, almost anyone with access to the Internet can access thousands of virtual training courses from anywhere in the world at any time. This means that training is no longer a formal process limited to a specific time and place, and everyone can follow the training they want at any time and place.

3. Specialization of education and variety of learning methods

In the past, the same group training was offered without considering the abilities of each individual, but technological developments have made teaching and learning a specific and individual issue. Today, everyone can receive a special training program depending on their abilities. This means that more training programs will be designed based on each person’s unique talents and abilities. Each learner can use one of the educational programs and tools depending on their abilities and interests.

4. Soft skills training

Various studies show that the job market today pays more attention to soft skills such as teamwork, creativity and critical thinking . Job seekers who learn these skills are more likely to be successful than those who have learned only difficult skills. This means that the education sector will pay more attention to teaching these skills in the near future.

5. A solution to the problem of reducing attention span

One of the problems faced by education activists is the issue of reducing the attention span of the new generation. A study by Microsoft shows that the learner attention span decreased by 4 seconds from 2000 to 2015, from 12 seconds to 8 seconds. This period will probably become shorter with the increasing influence of technology in human life.

The new generation pays more attention to visual and exciting content. Therefore, educational institutions and activists in this field must find attractive and new ways to attract the attention of the new generation to educational content.

6. Facilitation instead of education

Now that a whole new generation of educational content has been provided, learners feel more independent in learning and no longer depend on the teacher to learn as they used to. The role of teachers has now become a source of knowledge and a facilitator of learning.

Teachers now need to learn and apply soft skills such as problem solving and leadership to play a new role . Education activists must now turn the learning environment into a space for teamwork and dialogue.

Future teaching tools and methods

Future technologies and education

Now that you are familiar with some of the technological developments in educating the new generation, it is time to move on to the educational tools that will be used in the field of broad education in the near future. The purpose of using these tools is to meet the educational needs of the new generation and to train the skills that this generation needs to enter the labor market.

1. virtual teaching

Virtual education was also available in previous years, but was often very limited. Now, with the development of communication tools and the requirements that the corona epidemic has imposed on the education sector, this method has become widespread and popular all over the world. Virtual education is no longer just watching some boring videos from the classroom, but has become an active and effective way of teaching with the help of interactive tools.

Schools, universities and educational institutions now offer many of their courses and courses in a virtual way.

2. Artificial intelligence-based training programs

Businesses and the health sector are two areas in which artificial intelligence is growing rapidly. But the education sector is not far behind. The use of automated scoring systems and intelligent educational assistants are examples of the introduction of artificial intelligence into the education sector.

One interesting example is the question robot built by David Kellerman. First used at the University of New South Wales, the robot answers students’ questions by sending related files or instructional videos. This robot overcomes its weaknesses with each interaction and is a learning machine.

This example shows that artificial intelligence can have a future in education. AI responds to tedious tasks and repetitive questions to make teachers focus on more complex issues.

3. Immersion in the learning environment with the help of augmented reality and virtual reality technology

One of the attractive and effective tools that can solve the new generation attention span problem is augmented reality and virtual reality. These two tools immerse the learner in the learning environment, diverting all his attention and senses to the learning experience. These tools are especially useful for those learners who suffer from attention deficit disorder and make learning enjoyable.

In addition, these two technologies allow learners to learn things more deeply and from new angles, and deepen their learning.

4. Gamification

Transforming the work environment and work process into something like a game or gamification has been the focus of business activists for several years. Now the education department is gradually using the capacities of this method to teach the course content. Turning the process of teaching a content into a game makes the content attractive and learners pay more attention to it.

5. Use of data analysis in training

Data is very valuable in today’s world, and the education sector, although later than others, has finally realized this. Data analysis allows teachers to have a better view of the situation of learners and use the results of data analysis to optimally change teaching methods.

The use of data analysis in education is also encouraging for learners, because they understand that their voice is heard and effective.

6. Blockchain training and technology

Blockchain technology offers unique benefits in education. Storing data and large virtual courses through this technology, instead of being stored on a central server, can reduce the cost of virtual education and increase the security of learners in cyberspace.

7. Talking Robots

If you are looking for tips to write an article or you want to edit your textbooks, talking bots will help you. Robots that have the ability to talk to and guide learners will soon become an integral part of educational websites.

8. Instructional videos

Making instructional videos using various animation and graphic software has become very popular in recent years. As mentioned, the new generation is more interested in visual content. Realizing this, education activists also design and produce a variety of educational clips to better convey educational content to learners.

In today’s world, more than 2.3 billion people in the world are studying to watch educational movies, and this number will increase in the future.

What is your opinion about these developments? Have you experienced using any of the examples introduced in this article? It can be interesting to read about your experience.

Read more: E-learning; A successful way to train employees