Q1]

import java.util.*;

public class NegativeIntegers {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

       
        System.out.print("Enter the value of N: ");
        int N = scanner.nextInt();

      
        LinkedList<Integer> numbers = new LinkedList<>();

      
        System.out.println("Enter " + N + " integers:");
        for (int i = 0; i < N; i++) {
            int num = scanner.nextInt();
            numbers.add(num);
        }

      
        System.out.println("Negative Integers:");
        for (int num : numbers) {
            if (num < 0) {
                System.out.println(num);
            }
        }

        scanner.close();
    }
}


Q2]

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;

   
    static final String JDBC_URL = "jdbc:mysql://localhost:3306/your_database_name";
    static final String USER = "your_username";
    static final String PASSWORD = "your_password";

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        
        String username = request.getParameter("username");
        String password = request.getParameter("password");

        
        try (Connection conn = DriverManager.getConnection(JDBC_URL, USER, PASSWORD)) {
          
            String query = "SELECT * FROM Users WHERE username = ? AND password = ?";
            try (PreparedStatement pstmt = conn.prepareStatement(query)) {
                pstmt.setString(1, username);
                pstmt.setString(2, password);
                ResultSet rs = pstmt.executeQuery();

               
                if (rs.next()) {
                    out.println("<h2>Login Successful!</h2>");
                } else {
             
                    out.println("<h2>Error: Invalid username or password!</h2>");
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}