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JavaBean class in Java
A JavaBean is a specially constructed Java class written in the Java and coded according to the JavaBeans API specifications.
Following are the unique characteristics that distinguish a JavaBean from other Java classes −
It provides a default, no-argument constructor.
It should be serializable and that which can implement the Serializable interface.
It may have a number of properties which can be read or written.
It may have a number of "getter" and "setter" methods for the properties.
JavaBeans Properties
A JavaBean property is a named attribute that can be accessed by the user of the object. The attribute can be of any Java data type, including the classes that you define.
A JavaBean property may be read, write, read only, or write only. JavaBean properties are accessed through two methods in the JavaBean's implementation class −
| Sr.No. | Method & Description |
|---|---|
| 1 | getPropertyName() For example, if property name is firstName, your method name would be getFirstName() to read that property. This method is called accessor. |
| 2 | setPropertyName() For example, if property name is firstName, your method name would be setFirstName() to write that property. This method is called mutator. |
A read-only attribute will have only a getPropertyName() method, and a write-only attribute will have only a setPropertyName() method.
Example
class StudentsBean implements java.io.Serializable { private String firstName = null; private String lastName = null; private int age = 0; public StudentsBean() { } public String getFirstName() { return firstName; } public String getLastName() { return lastName; } public int getAge() { return age; } public void setFirstName(String firstName) { this.firstName = firstName; } public void setLastName(String lastName) { this.lastName = lastName; } public void setAge(Integer age) { this.age = age; } } public class Tester { public static void main(String[] args) { StudentsBean bean = new StudentsBean(); bean.setFirstName("Mahesh"); System.out.println(bean.getFirstName()); } } Output
Mahesh
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