?– Web server. In Java servlets, the init() method is automatically called by the servlet container (e.g., Tomcat, Jetty) when the servlet is first loaded into memory. It is part of the servlet lifecycle and is invoked only once during the servlet’s initialization. So, the correct answer to the question “Who is loading the init() method of servlet?” would be: The servlet container (or servlet engine) is responsible for loading and invoking the init() method of a servlet.

?– (1) Request Lifetime: Using this technique to pass beans, a request dispatcher (using either “include” or forward”) can be called. This bean will disappear after processing this request has been completed. Servlet: request. setAttribute(”theBean”, myBean); RequestDispatcher rd = getServletContext(). getRequestDispatcher(”thepage. jsp”); rd. forward(request, response); JSP PAGE:<jsp: useBean id=”theBean” scope=”request” class=”. . . . . ” />(2) Session Lifetime: Using this technique to pass beans that are relevant to a particular session (such as in individual user login) over a…

Read More Read More

If an expression involving the Boolean & operator is evaluated, both operands are evaluated. Then the &operator is applied to the operand. When an expression involving the && operator is evaluated, the first operand is evaluated. If the first operand returns a value of true then the second operand is evaluated. The && operator is then applied to the first and second operands. If the first operand evaluates to false, the evaluation of the second operand is skipped.

A component can handle its own events by implementing the required event-listener interface and adding itself as its own event listener. In Java, GUI components can handle their own events by implementing event listener interfaces. The most common way to handle events for GUI components is by implementing listener interfaces such as ActionListener, MouseListener, KeyListener, etc. Here is a brief explanation: Implementing Event Listener Interface: To handle events on a GUI component, you need to make your class implement the…

Read More Read More

The main difference between the three most commonly used String classes as follows. StringBuffer and StringBuilder objects are mutable whereas String class objects are immutable. StringBuffer class implementation is synchronized while StringBuilder class is not synchronized. Concatenation operator “+” is internally implemented by Java using either StringBuffer or StringBuilder. Criteria to choose among String, StringBuffer and StringBuilder If the Object value will not change in a scenario use String Class because a String object is immutable. If the Object value…

Read More Read More