Important Servlet Topics Introduction to Servlets Servlet Life Cycle Servlet Configuration Handling HTTP Requests and Responses Request Redirect and Forward Initialization Parameters and Context Parameters Servlet Filters Session Management Handling Cookies RequestDispatcher ServletContext Error Handling in Servlets 1. Introduction to Servlets Servlets are Java programs that extend the capabilities of a server. They can respond to any type of requests but are commonly used to handle HTTP requests in web applications. 2. Servlet Life Cycle The life cycle of a servlet is controlled by the servlet container, which follows these steps: Loading and Instantiation : The servlet class is loaded and an instance is created. Initialization : The init() method is called once for initialization. Request Handling : The service() method is called for each request, which then calls doGet(), doPost(), etc. Destruction : The destroy() method is called before the servlet is destroyed. Example...
To find the second-highest salary from a list of employees using Java 8 streams, you can follow these steps: Create a list of employees with their salaries. Use Java 8 streams to sort the employees by salary in descending order. Skip the first element (which is the employee with the highest salary). Get the first element of the remaining stream (which is the employee with the second-highest salary). Example code: java import java.util.ArrayList; import java.util.List; class Employee { private String name; private double salary; public Employee (String name, double salary) { this .name = name; this .salary = salary; } public double getSalary () { return salary; } } public class SecondHighestSalary { public static void main (String[] args) { List<Employee> employees = new ArrayList <>(); employees.add( new Employee ( "John" , 60000.0 )); employees.add( new Employe...