Question: How can I discover the size of a remote file stored on an HTTP server? Answer: The HTTP protocol supports the transfer of extra information about thecontent referenced by a URL. This information is stored in the HTTPheader fields. The Content-Length header provides the size of theobject referenced by
Question: How do I find the size of the heap memory that is available for Java program? Answer: The maximum size of the Java heap is fixed by the JVM runtime atstartup, but usually starts from a smaller initial value and graduallygrows to the maximum value as more memory is
Question: I want to collect form data in a JSP page where the form issubmitted by one of many possible links (possibly passing values usingURL rewriting). In one case, I have one text input box, followed bytwo links. The text input box’s data ends up in the HttpServletRequestobject. How do
Question: In VB, you can release the object’s memory with the following: set object = nothing How do you accomplish the same thing in Java? Answer: The analogous way of doing this is to set an object to null: object = null; However, this does not immediately free the memory
Question: How do I do a string comparison where I want to determine if onestring is contained within another? For example: Str1 = “Degree in IT”;Str2 = “Diploma or Degree in IT”; I want to see if Str1 is contined in Str2. Answer: The String class supports this type of
Question: How do I pass both the option value and option label parameter through ASP? select one Answer: Create a hidden input (text) box within the form: Then, write code for the ONCHANGE event of the SELECT control to populate the hidden text box: When the user chooses an option
Question: My Java server compiles perfectly, but when I try to run it on mymachine I get an error when it tries to open up the ServerSocket onport 2525. I have tried it on another machine and it works fine. Italso worked on my own machine the first few times
Question: On a POSIX-compliant system, is there a way to get the process ID ofthe JVM running the current code? Answer: There is no standard means of obtaining the process ID ofthe JVM. The most efficient way of implementing this is to write aJNI method that produces this information. However,
Question: I have a ResultSet created using JDBC and it contains some datefields. Now I want to subtract one date from the other. Howdo I do this? Answer: Date arithmetic in Java is performed by instances of the Calendarclass. The Date class, and subclasses thereof, are place holders for dateand