How to Create a Simple Bean in Java?

The following program demonstrates How to Create a Simple Bean in Java.

In Java, a simple bean is a class that follows the JavaBeans conventions, which typically include providing a default constructor, getter, and setter methods for its properties, and implementing Serializable if necessary. Here’s an example of a simple Java bean.

import java.io.Serializable;

public class PersonBean implements Serializable {
    private String name;
    private int age;

    public PersonBean() {
        // Default constructor
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "PersonBean{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

In this example:

The PersonBean class implements the Serializable interface to indicate that instances of this class can be serialized (i.e., converted into a byte stream) for storage or transmission.
Also, the class has two private properties: name and age.
Public getter (getName, getAge) and setter (setName, setAge) methods are provided for accessing and modifying the properties. These methods follow the JavaBeans naming conventions.
A default (no-argument) constructor is provided, which is a requirement for JavaBeans.
The toString method is overridden to provide a string representation of the bean for easy debugging and display.

You can use this PersonBean class to create instances of the bean and set/get its properties using the getter and setter methods. For example.

public class Main {
    public static void main(String[] args) {
        // Create a PersonBean instance
        PersonBean person = new PersonBean();

        // Set properties using setter methods
        person.setName("John");
        person.setAge(30);

        // Get properties using getter methods
        String name = person.getName();
        int age = person.getAge();

        // Display the bean
        System.out.println(person);

        // Serialization and other operations can be performed on the bean as needed
    }
}

This demonstrates the basic usage of a simple Java bean. You can expand upon this by adding more properties and methods as required for your application.

Further Reading