What is a JavaBean exactly?

Question

I understood, I think, that a \"Bean\" is a Java class with properties and getters/setters. As much as I understand, it is the equivalent of a C struct. Is that true?

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Answer 1

Explanation with an example.

1. import java.io.Serializable

As for the Serialization, see the documentation.

2. private fields

Fields should be private for prevent outer classes to easily modify those fields. Instead of directly accesing to those fields, usuagly getter/setter methods are used.

3. Constructor

A public constructor without any argument.

4. getter/setter

Getter and setter methods for accessing and modifying private fields.

/** 1. import java.io.Serializable */
public class User implements java.io.Serializable {
    /** 2. private fields */
    private int id;
    private String name;

    /** 3. Constructor */
    public User() {
    }
    public User(int id, String name) {
        this.id = id;
        this.name = name;
    }

    /** 4. getter/setter */
    // getter
    public int getId() {
        return id;
    }
    public String getName() {
        return name;
    }
    // setter
    public void setId(int id) {
        this.id = id;
    }
    public void setName(String name) {
        this.name = name;
    }
}