请大家帮忙看看下面问题出在哪里
错误提示是：
java.lang.NoClassDefFoundError: RecruitTypeDict

RecruitTypeDict.java

//package XKSoft.System;
import java.io.*;
import java.sql.*;
import java.lang.*;
import java.util.*;
import java.util.Date;

//import XKSoft.DBConnection.DBConnectionBean;
import DBConnectionBean;

public class RecruitTypeDict
{

private Connection myConn;
private String RecruitTypeName; //招生类型名称
private String Numbers;  //统一编号
DBConnectionBean myObj = new DBConnectionBean();


public void RecruitTypeDictBean()
{
myObj = DBConnectionBean.getInstance();
myConn = myObj.getConnection();
}
//获得招生类型名称
public String getRecruitTypeName()
{
return RecruitTypeName;
}
//赋值给招生类型名称
public void setRecruitTypeName(String RecruitTypeName)
{
this.RecruitTypeName = RecruitTypeName;
}
//获得统一编号
public String getNumbers()
{
return Numbers;
}
//赋值给统一编号
public void setNumbers(String Numbers)
{
this.Numbers = Numbers;
}
//增加招生类型函数
public boolean addRecruitType() 
{
boolean InsertSucceed = false; 
String sql = "insert into X_Pub_RecruitType(RecruitTypeName, Number) values (" + RecruitTypeName + ", " + Numbers + ")";
try
{
Statement stmt = myConn.createStatement();
InsertSucceed = stmt.execute(sql);
}
catch(SQLException e)
{
System.out.println("错误：" + e.toString());
}
return InsertSucceed;
}
//增加招生类型函数
public boolean updateRecruitType(int RecruitTypeID) 
{
boolean UpdateSucceed = false; 
String sql = "update X_Pub_RecruitType set RecruitTypeName="+RecruitTypeName+", Number="+Numbers+" where  RecruitType="+RecruitTypeID;
try
{
Statement stmt = myConn.createStatement();
UpdateSucceed = stmt.execute(sql);
}
catch(SQLException e)
{
System.out.println("错误：" + e.toString());
}
return UpdateSucceed;
}
//删除招生类型
public boolean deleteRecruitType(String RecruitType)
{
boolean DeleteSucceed = false;
String sql="delete from X_Pub_RecruitType where  RecruitType="+RecruitType;
try
{
Statement stmt = myConn.createStatement();
DeleteSucceed = stmt.execute(sql);
}
catch (SQLException e)
{
System.out.println("错误"+e.toString());
}
return DeleteSucceed;
}
//显示所有的招生类型记录
public  ResultSet SelectRecruitType()
{
ResultSet rs = null;
String Sql;
Sql="select * from x_pub_RecruitType";
try
{
Statement stmt = myConn.createStatement();
rs = stmt.executeQuery(Sql);
}
catch(SQLException e)
{
System.out.println("错误：" + e.toString());
}
return rs;
}
//根据招生ID查询招生类型记录
public  ResultSet SelectRecruitTypeID(int RecruitTypeID)
{
ResultSet rs = null;
String Sql;
Sql="select * from X_Pub_RecruitType where RecruitType="+RecruitTypeID;
try
{
Statement stmt = myConn.createStatement();
rs = stmt.executeQuery(Sql);
}
catch(SQLException e)
{
System.out.println("错误：" + e.toString());
}
return rs;
}

public static void main(String[] args) 
{

RecruitTypeDict objRecruits= new RecruitTypeDict();
objRecruits.RecruitTypeDictBean();
ResultSet rs=objRecruits.SelectRecruitType();
try
{
while(rs.next())
{
System.out.println(rs.getInt("RecruitType"));
}
}
catch(SQLException e)
{
System.out.println("error:"+e.getMessage());
e.printStackTrace();
}
}
}

===========================================
DBConnectionBean.java

//package XKSoft.DBConnection;

import java.io.*;
import java.sql.*;
import java.util.*;

public class DBConnectionBean
{

    public DBConnectionBean()
    {
        conn = null;
    }

    public static synchronized DBConnectionBean getInstance()
    {
        if(instance == null)
            instance = new DBConnectionBean();
        return instance;
    }

    public Connection getConnection()
    {
        if(conn == null)
            conn = newConnection();
        return conn;
    }

    private synchronized Connection newConnection()
    {
        java.io.InputStream inputstream = getClass().getResourceAsStream("db.properties");
        Properties properties = new Properties();
        try
        {
            properties.load(inputstream);
        }
        catch(Exception exception)
        {
            System.err.println("u4E0Du80FDu8BFBu53D6u5C5Eu6027u6587u4EF6.u8BF7u786Eu4FDDdb.propertiesu5728CLASSPATHu6307u5B9Au7684u8DEFu5F84u4E2D");
            return null;
        }
        String s = properties.getProperty("logfile", "DBConnectionManager.log");
        try
        {
            log = new PrintWriter(new FileWriter(s, true), true);
        }
        catch(IOException ioexception)
        {
            System.err.println("u65E0u6CD5u6253u5F00u65E5u5FD7u6587u4EF6: " + s);
            log = new PrintWriter(System.err);
        }
        conn = createConnection(properties);
        return conn;
    }

    private Connection createConnection(Properties properties)
    {
        for(Enumeration enumeration = properties.propertyNames(); enumeration.hasMoreElements();)
        {
            String s = (String)enumeration.nextElement();
            if(s.endsWith(".url"))
            {
                String s1 = s.substring(0, s.lastIndexOf("."));
                String s2 = properties.getProperty(s1 + ".url");
                if(s2 == null)
                {
                    log("u6CA1u6709u4E3Au8FDEu63A5u6C60" + s1 + "u6307u5B9AURL");
                } else
                {
                    String s3 = properties.getProperty("drivers");
                    String s4 = properties.getProperty(s1 + ".user");
                    String s5 = properties.getProperty(s1 + ".password");
                    String s6 = properties.getProperty(s1 + ".maxconn", "0");
                    int i;
                    try
                    {
                        i = Integer.valueOf(s6).intValue();
                    }
                    catch(NumberFormatException numberformatexception)
                    {
                        log("u9519u8BEFu7684u6700u5927u8FDEu63A5u6570u9650u5236: " + s6 + " .u8FDEu63A5u6C60: " + s1);
                        boolean flag = false;
                    }
                    log("u6210u529Fu521Bu5EFAu8FDEu63A5u6C60" + s1);
                    try
                    {
                        Class.forName(s3).newInstance();
                        Connection connection = DriverManager.getConnection(s2, s4, s5);
                        //log(new Date() + ":t" + "u6210u529Fu5EFAu7ACBu8FDEu7ED3");
                        return connection;
                    }
                    catch(Exception exception)
                    {
                        //log(new Date() + ":t" + "u65E0u6CD5u5EFAu7ACBu8FDEu7ED3(" + exception.toString() + ")");
                    }
                }
            }
        }

        return null;
    }

    private void log(String s)
    {
        //log.println(new Date() + ":t" + s);
    }

    public synchronized void release()
    {
        try
        {
            conn.close();
            log("u5173u95EDu6240u6709u8FDEu7ED3uFF01");
            log.close();
        }
        catch(SQLException sqlexception)
        {
            log("u65E0u6CD5u5173u95EDu8FDEu63A5u6C60u4E2Du7684u8FDEu63A5: (" + sqlexception.toString() + ")");
        }
    }

    private static DBConnectionBean instance;
    private PrintWriter log;
    private Connection conn;
}

=============================
db.properties

drivers=com.microsoft.jdbc.sqlserver.SQLServerDriver
logfile=C:\WINNT\System32\log.txt

access.url=jdbc:microsoft:sqlserver:/

从错误的提示看应该是你不小心搞错了文件名或带.java的问题，但从你写程序来看，又应该不会不考虑这个问题的。既然错误是java.lang.NoClassDefFoundError: RecruitTypeDict，应改来说不会是程序的问题（请原谅，本人很懒，没看你的程序），个人觉得这个错误绝不会是程序的错（public class RecruitTypeDict这个和错误提示决定）。

请确认 Javac是否用错！

程序没有出错！我帮你测过，我同意楼上的观点