JavaBeans are classes that encapsulate many objects into a single object (the bean). It is a java class that should follow following conventions:
- Must implement Serializable.
- It should have a public no-arg constructor.
- All properties in java bean must be private with public getters and setter methods.
// Java program to illustrate the// structure of JavaBean classpublic class TestBean {private String name;public void setName(String name) { this.name = name; }public String getName() { return name; }} |
Syntax for setter methods:
- It should be public in nature.
- The return-type should be void.
- The setter method should be prefixed with set.
- It should take some argument i.e. it should not be no-arg method.
Syntax for getter methods:
- It should be public in nature.
- The return-type should not be void i.e. according to our requirement we have to give return-type.
- The getter method should be prefixed with get.
- It should not take any argument.
For Boolean properties getter method name can be prefixed with either “get” or “is”. But recommended to use “is”.
// Java program to illustrate the// getName() method on boolean type attributepublic class Test {private boolean empty;public boolean getName() { return empty; }public boolean isempty() { return empty; }} |
Implementation
// Java Program of JavaBean classpackage geeks;public class Student implements java.io.Serializable{private int id;private String name;public Student() { }public void setId(int id) { this.id = id; }public int getId() { return id; }public void setName(String name) { this.name = name; }public String getName() { return name; }} |
// Java program to access JavaBean classpackage geeks;public class Test {public static void main(String args[]) { Student s = new Student(); // object is created s.setName("GFG"); // setting value to the object System.out.println(s.getName()); }} |
Output:
GFG
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