Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Random;
public class NumberGuess 
{

    public static void main(String[] args) throws IOException 
    {
        // TODO Auto-generated method stub
        int max=0,min=0;
        Random rand=new Random();
        
        int ComputerNumber=rand.nextInt(100);
        while(true)
        {
            System.out.println("Is the number:"+ComputerNumber);
            System.out.println("Please give higher or lower or yes:");
            InputStreamReader input = new InputStreamReader(System.in);
            BufferedReader reader = new BufferedReader(input);
            String value=reader.readLine();
            String yes="yes",lower="lower",higher="higher";
            int temp;
            if(value.equals(yes))
            {
                System.exit(0);
            
            }
            if(value.equals(lower))
            {
                int temp1=ComputerNumber;//57    
                temp=ComputerNumber+(rand.nextInt(ComputerNumber))+1;
                ComputerNumber=temp;
                System.out.println("New number:"+ComputerNumber);
            
            }
            if(higher.equals(value))
            {    
                int temp1=(ComputerNumber%10)/2-10;//59
                int temp2=(ComputerNumber/10)*10;
                temp=(ComputerNumber-rand.nextInt(ComputerNumber));
                System.out.println(temp1);
                System.out.println(temp2);
                ComputerNumber=temp2+temp1+1;
                System.out.println("New number:"+ComputerNumber);
            
            }
        }// end
    }//main end
}//

public class login_servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
 
    public login_servlet() {
        super();
    }
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
        //this.getServletContext().getRequestDispatcher( "/login.jsp" ).forward( request, response );
    }
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
        java.sql.Connection connexion = null;
        java.sql.Statement statement = null;
        ResultSet resultat = null;
        String userQuery="";
 
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
        }
 
        try {
            connexion = DriverManager.getConnection("jdbc:mysql://localhost:3306/Dlala", "IPLS", "password");
        } catch (SQLException e) {
            e.printStackTrace();
        }
 
        try {
            statement = connexion.createStatement();
 
            // Exécution de la requête
            resultat = statement.executeQuery("SELECT user FROM Client;");
 
            // Récupération des données
            while (resultat.next()) {
                userQuery = resultat.getString("user");
            }
        } catch (SQLException e) {
        } finally {
            // Fermeture de la connexion
            try {
                if (resultat != null)
                    resultat.close();
                if (statement != null)
                    statement.close();
                if (connexion != null)
                    connexion.close();
            } catch (SQLException ignore) {
            }
        }
        //************************************************//
 
        response.setContentType("text/html");   
        PrintWriter out = response.getWriter();   
 
        String n=request.getParameter("user");   
        String p=request.getParameter("pass");  
 
        HttpSession session = request.getSession(false); 
        if(session!=null) 
        session.setAttribute("name", n); 
 
        if( n.equals(userQuery)){   
            RequestDispatcher rd=request.getRequestDispatcher("home.jsp");   
            rd.forward(request,response);   
        }   
        else{  
            out.print("<p style=\"color:red\">Sorry username or password error</p>");   
            RequestDispatcher rd=request.getRequestDispatcher("login.jsp");   
            rd.include(request,response);   
        } 
        out.close(); 
    }
}

DatabseDAO cannot be resolved to a type // in the browser

// DAO class - in file 1
import java.sql.*;
import java.io.*;
import java.util.*;

public class DatabseDAO implements Serializable
{
        /// ........... all the code here
}

// bean class - in file 2
import java.io.*;

public class PersonBean implements Serializable
{
  /// ........... all the code here
}

<%
    DatabseDAO db2 = new DatabseDAO();

    ArrayList persons_list = db2.GetPersons("SELECT * FROM People");
    PersonBean person_bean = null;

    for (int i=0; i<persons_list.size(); i++)
    {
        person_bean = (PersonBean) persons_list.get(i);
%>

        <tr>
            <td><% =person_bean.getPersonId() %></td>
            <td><% =person_bean.getPersonName() %></td>
            <td><% =person_bean.getPersonAddress() %></td>
        </tr>
<%
    }
%>