[Basic specification] JavaBeans specification

This article from Wikipedia: Http://en.wikipedia.org/wiki/JavaBeans#JavaBean_conventions

JavaBeans is a reusable software component in the Java language, which is a special Java class that encapsulates many objects into an object (bean). The feature is serializable, providing a parameterless constructor that provides getter methods and setter methods to access the properties of the object.

Advantages:

• The bean can control whether its properties, events, and methods are exposed to other programs.
• The bean can receive events from other objects, or it can produce events to other objects.
• There is software available to configure the Bean.
• The attributes of the bean can be serialized for later reuse.

JavaBeans specification, to become a JavaBean class, you must follow specific specifications about naming, constructors, methods. With these specifications, you have the tools to use, reuse, replace, and connect JavaBeans.

The specifications are as follows:

• There is a public parameterless constructor.
• Properties can be accessed through get,set, is (can override get, use on Boolean properties) methods, or other methods that follow a specific naming convention.
• Serializable.

An example of a JavaBean code

Package player; public class Personbean implements java.io.Serializable {     /**     * Name Property (note case)     */    private String name = N ull;     Private Boolean deceased = false;     /** parameterless Constructor (no parameters) */public    Personbean () {    }     /**     * Name Property getter Method */Public    String getName () {        return name;    }     /**     * The setter method for the Name property     * @param value *     /public    void SetName (final String value) {        name = value;    }     /**     * Deceased Property getter Method     * Different form of Getter method for Boolean attribute (is used here instead of get) */Public    Boolean isdeceased () {        return deceased;    }     /**     * Deceased Property setter Method     * @param value *    /public void setdeceased (final boolean value) {        deceased = value;    }}

Test examples:

Import player. Personbean; /** * <code>TestPersonBean</code> Classes */public class Testpersonbean {    /**     * Personbean class test method's main function     * @param args */public    static void Main (string[] ARGS) {        Personbean person = new Personbean ();         Person.setname ("Zhang San");        Person.setdeceased (false);         Output: "Zhang San [alive]"        System.out.print (Person.getname ());        System.out.println (person.isdeceased ()? "[Deceased]": "[Alive]");}    }

Page reference and use JavaBean

<%//Use Personbean class%><jsp:usebean id= "person" class= "player in JSP. Personbean "scope=" page "/><jsp:setproperty name=" person "property=" * "/> 




[Basic specification] JavaBeans specification