notes on core java in java

Threads block on I/O (that is enters the waiting state) so that other threads may execute while the I/O Operation is performed. Threads often block on I/O (Input/Output) operations in Java due to the nature of these operations. When a thread performs I/O, such as reading from a file, writing to a network socket, or … Read more

A transient variable is a variable that may not be serialized. In Java, a transient variable is a variable that is marked with the transient keyword. When an instance of a class is serialized, the values of its transient variables are not included in the serialized form. This means that transient variables are not part … Read more

JSP pages are focused around HTML (or XML) with Java codes and JSP tags inside them. When a web server that has JSP support is asked for a JSP page, it checks to see if it has already compiled the page into a servlet. Thus, JSP pages become servlets and are transformed into pure Java … Read more

Say that I have a cookie called “foo, ” that I set a while ago & I want it to go away. I simply: <% Cookie killCookie = new Cookie(”foo”, null); KillCookie. setPath(”/”); killCookie. setMaxAge(0); response. addCookie(killCookie); %> In JavaServer Pages (JSP), you can delete a cookie using the HttpServletResponse object. Here’s an example of … Read more

response. setHeader(”Set-Cookie”, “cookie string”); To give the response-object to a bean, write a method setResponse (HttpServletResponse response) – to the bean, and in jsp-file:<% bean. setResponse (response); %> To set a cookie in JSP (JavaServer Pages), you can use the following syntax and code: jsp <%@ page import=”javax.servlet.http.Cookie” %> <% Cookie myCookie = new Cookie(“cookieName”, … Read more