runtime

一、概述 Runtime类封装了运行时的环境。每个 Java 应用程序都有一个 Runtime 类实例，使应用程序能够与其运行的环境相连接。 一般不能实例化一个Runtime对象，应用程序也不能创建自己的 Runtime 类实例，但可以通过 getRuntime 方法获取当前Runtime运行时对象的引用。 一旦得到了一个当前的Runtime对象的引用，就可以调用Runtime对象的方法去控制Java虚拟机的状态和行为。 当Applet和其他不被信任的代码调用任何Runtime方法时，常常会引起SecurityException异常。 二、API预览 addShutdownHook(Thread hook) 注册新的虚拟机来关闭挂钩。 availableProcessors() 向 Java 虚拟机返回可用处理器的数目。 exec(String command) 在单独的进程中执行指定的字符串命令。 exec(String[] cmdarray) 在单独的进程中执行指定命令和变量。 exec(String[] cmdarray, String[] envp) 在指定环境的独立进程中执行指定命令和变量。 exec(String[] cmdarray, String[] envp, File dir) 在指定环境和工作目录的独立进程中执行指定的命令和变量。 exec(String

title date categories Webpack 2018-08-08 10:38:04 +0800 Webpack 概念^1 At its core, webpack is a static module bundler for modern JavaScript applications. When webpack processes your application, it internally builds a dependency graph which maps every module your project needs and generates one or more bundles. 作用 在 getting-started 说得很清楚 传统的html与静态文件结构类似 project webpack-demo |- package.json + |- index.html + |- /src + |- index.js src/index.js function component() { let element = document.createElement('div'); // Lodash, currently included via a script, is required for this line to work element

Is it possible to have a Fortran program load a Fortran library at run time? If so, would it be possible to modify a function and recompile only the library to have the originally-compiled program call the modified function in the library at run time? If anyone can provide a minimal working example of how this could be achieved that would be great. Here are some few links that can be helpfull: This page on rosettacode.org which gives complete example with details and discuss implementation on linux and MACOS This intel forum post where Steve Lionel give some advice on how to do the dynamic

I have a few types that are like this // a value that is aware of its key type (K) Bar<K> // something that deals with such values and keys Foo<V extends Bar<K>, K> How would one recreate Foo such that you could consume it in Guice? The bit I'm stuck on is how to cross reference the K from Bar to the 2nd parameterized type of Foo. So for example, WildcardType kType = Types.subtypeOf(Object.class); WildcardType barType = Types.subtypeOf(Types.newParameterizedType(Bar.class, pipeKey)); ParameterizedType fooType = Types.newParameterizedType(Foo.class, pipelineableType, pipeKey); Really this seems

Basically I have some code where when it happens, I need to set some object equal to some expression. All of this "what to do" jazz is stored as a string. So I parse it, and use reflection to find the object I am doing it to. Now I need to find out how to store the value to this object. The problem is the value could be "1", "1*(5/2)", or "some string value". It would be really cool if I could have expressions like "this.SomeProperty" or "(x > 3 ? 4 : 5)". Also, the object it is storing to, could be a string, int, double, or float at the minimum. The VS2008 samples included a nifty

I got asked an interview question that wanted me to discern the Big-O notation of several logarithmic functions. The functions were as follows: f(x) = log 5 (x) f(x) = log(x 5 ) f(x) = log(6*log x) f(x) = log(log x) I was told that the Big-O for the first and second are not equivalent and the third and fourth are not equivalent after mistakenly guessing the opposite. Can anyone explain why they are not equivalent and what their Big-O are then? log 5 x is the same as writing log log log log log x, which is a very slow-growing function of x. This is equivalent to 5 log x (rewriting

From the help information: -J<flag> Pass <flag> directly to the runtime system. Use one -J for each runtime flag or flag argument -R<flag> Pass <flag> to the remote runtime system. Use one -R for each remote flag or flag argument I cannot find an explanation in both the tools documentation and jshell user guide . Also, what is "the remote runtime system" in the context of jshell? As I understand it, JShell has 3 main 'places' to execute code: In the current process (see DirectExecutionControl ) In the same JVM as the JShell client (see LocalExecutionControl ) On the remote agent (see

HI all, I'm just getting started with developing for Android. I'm looking to port one of my iPhone applications, but I'm kind of at a loss for how to draw a view at runtime (a view not declared in the XML). Basically, I want to draw a simple rectangle, but then be able to manipulate its frame after being drawn. Sorry if this is a really, really simple question, but I can't seem to find some equivalent to the iPhone SDK here. Thanks in advance! Steve Haley It sounds like you want to experiment with 2D graphics - for that, you should use a Canvas . You can control the drawing of the Canvas