Is this a javabean?

Question

I am a newcomer in java and I am taking over the codes from my predecessor. And today i read some javabean codes below. but there seems to be no difference between javabean and the general class?
------------------------------------------------------code-------------
package com.hqcomm.beans;
import java.io.PrintStream;
import java.sql.*;
public class DbBean
public ResultSet executeQuery(Connection connection, String s)
ResultSet resultset = null;
try
Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
resultset = statement.executeQuery(s);
catch(SQLException sqlexception)
System.err.println("db.executeQuery: " + sqlexception.getMessage());
return resultset;
public int executeSQL(Connection connection, String s)
int i = 0;
try
Statement statement = connection.createStatement();
i = statement.executeUpdate(s);
statement.close();
catch(SQLException sqlexception)
System.err.println("db.executeUpdate: " + sqlexception.getMessage());
return i;
public boolean changepwd(Connection connection, String s, String s1)
boolean flag;
flag = false;
try
String s2 = " update A_Register set C_PassWD = '" + s1 + "' where RegisterId = '" + s + "' ";
Statement statement = connection.createStatement();
int i = statement.executeUpdate(s2);
System.out.println(s2 + "****" + i);
if(i == 1)
flag = true;
else
flag = false;
statement.close();
catch(Exception exception)
System.err.println(exception);
return flag;
public static String toChinese(String s)
try
if(s == null)
return null;
else
s = new String(s.getBytes("ISO-8859-1"), "GB2312");
return s;
catch(Exception exception)
return null;
}

Answer 1

All java beans are java
classes and not vice-versa. Wrong, for example the Math or System class aren't beans.
A class needs to meet certain requirements in order to call itself bean.
One is to hava a public constructor, which does not take any arguments.
For the official specs of java beans see
http://java.sun.com/products/javabeans/docs/spec.html
and documents referenced therein.
For a lot of the day to day work you can use the strongly simplified version:
a bean is a class with a public constructor an properties which a accessible through getPropertyName and setPropteryName
regards
Spieler