ns22

85

Q1]

import java.util.Scanner;

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

    int choice;
    do {
        System.out.println("Menu:");
        System.out.println("1. Insert");
        System.out.println("2. Update");
        System.out.println("3. Display");
        System.out.println("4. Exit");
        System.out.print("Enter your choice: ");
        choice = scanner.nextInt();

        switch (choice) {
            case 1:
                database.insertEmployee();
                break;
            case 2:
                database.updateEmployee();
                break;
            case 3:
                database.displayEmployees();
                break;
            case 4:
                System.out.println("Exiting...");
                break;
            default:
                System.out.println("Invalid choice!");
        }
    } while (choice != 4);

    scanner.close();
}

}

class EmployeeDatabase {
private int ENo = 1; // Initial employee number
private Employee[] employees = new Employee[10]; // Assuming maximum of 10 employees

public void insertEmployee() {
    Scanner scanner = new Scanner(System.in);
    System.out.print("Enter employee name: ");
    String EName = scanner.nextLine();
    System.out.print("Enter salary: ");
    double salary = scanner.nextDouble();

    Employee employee = new Employee(ENo++, EName, salary);
    for (int i = 0; i < employees.length; i++) {
        if (employees[i] == null) {
            employees[i] = employee;
            System.out.println("Employee inserted successfully!");
            return;
        }
    }
    System.out.println("Employee database is full!");
}

public void updateEmployee() {
    Scanner scanner = new Scanner(System.in);
    System.out.print("Enter employee number to update: ");
    int searchENo = scanner.nextInt();
    for (int i = 0; i < employees.length; i++) {
        if (employees[i] != null && employees[i].ENo == searchENo) {
            System.out.print("Enter new employee name: ");
            String newEName = scanner.nextLine(); // Consume newline
            newEName = scanner.nextLine(); // Read new employee name
            System.out.print("Enter new salary: ");
            double newSalary = scanner.nextDouble();
            employees[i].EName = newEName;
            employees[i].Salary = newSalary;
            System.out.println("Employee updated successfully!");
            return;
        }
    }
    System.out.println("Employee not found!");
}

public void displayEmployees() {
    System.out.println("Employee details:");
    for (Employee employee : employees) {
        if (employee != null) {
            System.out.println(employee);
        }
    }
}

}

class Employee {
int ENo;
String EName;
double Salary;

public Employee(int ENo, String EName, double Salary) {
    this.ENo = ENo;
    this.EName = EName;
    this.Salary = Salary;
}

@Override
public String toString() {
    return "ENo: " + ENo + ", EName: " + EName + ", Salary: " + Salary;
}

}

Q2]

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Greeting Page</title> </head> <body> <h2>Greeting Page</h2> <form action="GreetUserServlet" method="post"> <label for="username">Enter your name:</label> <input type="text" id="username" name="username" required><br><br> <input type="submit" value="Greet"> </form> </body> </html>

GreetUserServlet.java

import java.io.IOException;
import java.io.PrintWriter;
import java.time.LocalTime;

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

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

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


    LocalTime currentTime = LocalTime.now();
    int hour = currentTime.getHour();

 
    String greeting;
    if (hour >= 4 && hour < 12) {
        greeting = "Good morning";
    } else if (hour >= 12 && hour < 18) {
        greeting = "Good afternoon";
    } else {
        greeting = "Good evening";
    }


    out.println("<h2>" + greeting + ", " + username + "!</h2>");
}

}