This is really late, but here’s how you can find where a method is defined: http://gist.github.com/76951 # How to find out where a method comes from. # Learned this from Dave Thomas while teaching Advanced Ruby Studio # Makes the case for separating method definitions into # modules, especially when enhancing built-in classes. module Perpetrator … Read more
You can only add folders or jar files to a class loader. So if you have a single class file, you need to put it into the appropriate folder structure first. Here is a rather ugly hack that adds to the SystemClassLoader at runtime: import java.io.IOException; import java.io.File; import java.net.URLClassLoader; import java.net.URL; import java.lang.reflect.Method; public … Read more
constexpr functions will be evaluated at compile time when all its arguments are constant expressions and the result is used in a constant expression as well. A constant expression could be a literal (like 42), a non-type template argument (like N in template<class T, size_t N> class array;), an enum element declaration (like Blue in … Read more
You need to use WebConfigurationManager.OpenWebConfiguration(): For Example: Dim myConfiguration As Configuration = System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration(“~”) myConfiguration.ConnectionStrings.ConnectionStrings(“myDatabaseName”).ConnectionString = txtConnectionString.Text myConfiguration.AppSettings.Settings.Item(“myKey”).Value = txtmyKey.Text myConfiguration.Save() I think you might also need to set AllowLocation in machine.config. This is a boolean value that indicates whether individual pages can be configured using the element. If the “allowLocation” is false, it cannot be … Read more
Reloading existing classes with existing data is likely to break things. You can load new code into new class loaders relatively easily: ClassLoader loader = URLClassLoader.newInstance( new URL[] { yourURL }, getClass().getClassLoader() ); Class<?> clazz = Class.forName(“mypackage.MyClass”, true, loader); Class<? extends Runnable> runClass = clazz.asSubclass(Runnable.class); // Avoid Class.newInstance, for it is evil. Constructor<? extends Runnable> … Read more
The difference between compile time and run time is an example of what pointy-headed theorists call the phase distinction. It is one of the hardest concepts to learn, especially for people without much background in programming languages. To approach this problem, I find it helpful to ask What invariants does the program satisfy? What can … Read more
Here is the way to go: Runtime rt = Runtime.getRuntime(); String[] commands = {“system.exe”, “-get t”}; Process proc = rt.exec(commands); BufferedReader stdInput = new BufferedReader(new InputStreamReader(proc.getInputStream())); BufferedReader stdError = new BufferedReader(new InputStreamReader(proc.getErrorStream())); // Read the output from the command System.out.println(“Here is the standard output of the command:\n”); String s = null; while ((s = stdInput.readLine()) … Read more
You need to capture both the std out and std err in the process. You can then write std out to a file/mail or similar. See this article for more info, and in particular note the StreamGobbler mechanism that captures stdout/err in separate threads. This is essential to prevent blocking and is the source of … Read more
Invoking dispose() allows the host platform to reclaim memory consumed by the heavyweight peer, but it can’t do so until after the WINDOW_CLOSING event is processed on the EventQueue. Even then, gc() is a suggestion. Addendum: Another way to see the nightmare is via a profiler. Running the example below with jvisualvm, one can see … Read more
Well this will run until EOF is detected. EOF can be ‘inserted’ pressing ctrl+D in Linux terminal. It works OK then. change while ((c = getchar()) != EOF) to while ((c = getchar()) != ‘\n’) and it will only ask you for one line of input and then return the result. btw: main is of … Read more