What is Java Bean?

JavaBean is a software component model for developing reusable software components in Java. It is a simple and powerful way to create software components that we can easily integrate into other applications.

A JavaBean is a simple Java class that has the following conventions:

• It should have private variables
• It should have a no-argument constructor.
• It should be Serializable to make it transferable in the Network.
• It should provide methods to set and get the values of the properties
  • We can call these methods a getter and setter.
  • The setter method’s return type should be void

Properties

• A JavaBean property is a named attribute that we can access by the user of the object. 
• The attribute can be of any Java data type, including the classes that we define.
• A JavaBean property can be read, write, read-only, or write-only.
• We can access JavaBean properties through two methods in JavaBean’s implementation class. Example:

• A read-only attribute will have only a getPropertyName() method, and a write-only attribute will have only a setPropertyName() method.

JavaBean class Example

public class Student {
	private int rollNo;
	private String name;
	private char gender;

	public int getRollNo() {
		return rollNo;
	}

	public void setRollNo(int rollNo) {
		this.rollNo = rollNo;
	}

	public String getName() {
		return name;
	}

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

	public char getGender() {
		return gender;
	}

	public void setGender(char gender) {
		this.gender = gender;
	}
}