runtime

Java compiler at Runtime

房东的猫 提交于 2019-12-05 05:42:59
In my current project, I need to compile java code at runtime (in the background to process input from the user). This works fine with tools.jar in the classpath. However, not all users of my program have JDK installed on their system. Some of them only have JRE and in that case there is no java compiler available at runtime. I can solve that problem by including tools.jar from Sun as a part of my tool. But tools.jar is very big (>12 MB). The problem is that I have to include the large jar file, although I am interested only in a small fraction of the functionality provided by this jar. Is it

Windows使用Java执行cmd代码

自闭症网瘾萝莉.ら 提交于 2019-12-05 04:17:42
话不多说,直入正题 今天给大家分享下,怎么在Windows上使用Java执行Cmd代码! 首先默认大家都熟悉cmd代码,以及cmd的命令行操作。 直接在main方法中写这一行(需要抛出异常),可以直接打开记事本。 Runtime.getRuntime().exec("cmd /c notepad"); @Test public void test6() throws IOException { Runtime.getRuntime().exec("cmd /c notepad"); } 或者: //这是我在Idea里面写的代码部分 try{ //添加要执行的命令,"cmd /c calc"(打开计算器) Runtime.getRuntime().exec("cmd /c notepad"); (打开记事本) //命令中notepad代表要执行打开记事本,需要其他指令请自己百度查找cmd命令,或者给楼主发消息留言 /*cmd /c ping www.baidu.com 是执行完ping命令后关闭命令窗口 cmd /k ping www.baidu.com 是执行完ping命令后不关闭命令窗口 cmd /c ping www.baidu.com 会打开一个新窗口后执行ping命令,原窗口会关闭 cmd /k ping www.baidu.com 会打开一个新窗口后执行ping命令

深入理解.NET Core的基元: deps.json, runtimeconfig.json, dll文件

六月ゝ 毕业季﹏ 提交于 2019-12-05 04:09:55
原文: 深入理解.NET Core的基元: deps.json, runtimeconfig.json, dll文件 原文链接: Deep-dive into .NET Core primitives: deps.json, runtimeconfig.json, and dll's 作者: Nate McMaster C#编译器(The C# Compiler) # C#的编译器可以将cs文件转换为dll文件, 即程序集文件。程序集文件是一个便携的可执行格式文件, 借助.NET Core,它可以运行在Windows, MacOS和Linux系统中。 在Windows系统中, .NET Core的编译器文件csc.dll存放在以下目录中 CopyC:\Program Files\dotnet\sdk\[.NET Core 版本号]\Roslyn\bincore 笔者使用了2.1.400版本,所以编译器存放目录是C:\Program Files\dotnet\sdk\2.1.400\Roslyn\bincore .NET Core编译器文件 csc.dll 也是一个.NET Core应用程序,所以你可以使用 dotnet 命令直接执行编译器 CopyC:\test>dotnet C:\Program Files\dotnet\sdk\2.1.400\Roslyn\bincore

Runtime Method Swizzling开发实例汇总

陌路散爱 提交于 2019-12-05 03:59:31
前言:什么是Method Swizzling,在iOS开发中它有什么作用? 简单来说我们主要是使用Method Swizzling来把系统的方法交换为我们自己的方法,从而给系统方法添加一些我们想要的功能。该篇文章主要列举Method Swizzling在开发中的一些现实用例,同时文中也有补充读者的一些疑点。 希望阅读文章的朋友们也可以提供一些文中尚未举出的例子,本文持续更新中。 目前已更新实例汇总: 实例一:替换ViewController生命周期方法 实例二:解决获取索引、添加、删除元素越界崩溃问题 实例三:防止按钮重复暴力点击 实例四:全局更换控件初始效果 实例五:App热修复 实例六:App异常加载占位图通用类封装 实例七:全局修改导航栏后退(返回)按钮 Method Swizzling通用方法封装 在列举之前,我们可以将Method Swizzling功能封装为类方法,作为NSObject的类别,这样我们后续调用也会方便些。 #import <Foundation/Foundation.h> #import <objc/runtime.h> @interface NSObject (Swizzling) + (void)methodSwizzlingWithOriginalSelector:(SEL)originalSelector bySwizzledSelector:

go语言入门(10)并发编程

三世轮回 提交于 2019-12-05 03:49:35
1,概述 1.1并发和并行 并行(parallel) : 指在同一时刻,有多条指令在多个处理器上同时执行。 并发(concurrency) : 指在同一时刻只能有一条指令执行,但多个进程指令被快速的轮换执行,使得在宏观上具有多个进程同时执行的效果,但在微观上并不是同时执行的,只是把时间分成若干段,使多个进程快速交替的执行。 1.2go语言并发优势   有人把Go比作21世纪的C语言,第一是因为Go语言设计简单,第二,21世纪最重要的就是并行程序设计,而Go从语言层面就支持了并行。同时,并发程序的内存管理有时候是非常复杂的,而Go语言提供了自动垃圾回收机制。   Go语言为并发编程而内置的上层API基于CSP(communicating sequential processes, 顺序通信进程)模型。 这就意味着显式锁都是可以避免的 ,因为Go语言通过相册安全的通道发送和接受数据以实现同步,这大大地简化了并发程序的编写。   一般情况下,一个普通的桌面计算机跑十几二十个线程就有点负载过大了,但是同样这台机器却可以轻松地让成百上千甚至过万个goroutine进行资源竞争。 2,goroutine 2.1goroutine是什么   goroutine是Go并行设计的核心。goroutine说到底其实就是协程,但是它比线程更小,十几个goroutine可能体现在底层就是五六个线程

C++ Assign a const value at run-time?

蹲街弑〆低调 提交于 2019-12-05 03:34:40
I have a constant value that never changes during run-time, but is impossible to know until run-time. Is there a way to declare a constant (either as a member of a class or not) without defining it and also assign a computed value once (and only once) it is determined; or am I going to have to resort to a non-const declaration and use coding S & Ps ( ALL_CAPS variables names, static declaration if in a class, etc.) to try and keep it from changing? CLARIFICATION: Though these are good answers, the real-world situation I have is more complicated: The program has a main loop that continually

Command failed due to signal: Segmentation fault: 11 while emitting IR SIL function

只谈情不闲聊 提交于 2019-12-05 03:21:42
I want to add closure properties in the extension of UITextView so I define a closure using typealias: typealias TextViewHeightDidChangedClosure = (_ currentTextViewHeight:CGFloat)->Void extension UITextView{ func setTextViewHeightDidChanged(textViewHeightDidChanged:TextViewHeightDidChangedBlock){ objc_setAssociatedObject(self, &TextViewHeightDidChangedBlockKey, textViewHeightDidChanged, objc_AssociationPolicy.OBJC_ASSOCIATION_COPY_NONATOMIC) } func textViewHeightDidChanged()->TextViewHeightDidChangedBlock?{ let textChanged : ((CGFloat)->Void) = objc_getAssociatedObject(self,

[Go] gocron源码阅读-判断是否使用root用户执行

我们两清 提交于 2019-12-05 03:10:34
判断是linux系统,并且uid为0,allowRoot是通过命令行传参传进来的,通过flag包解析出来的,可以使用go run node.go -h看到这些参数 if runtime.GOOS != "windows" && os.Getuid() == 0 && !allowRoot { log.Fatal("Do not run gocron-node as root user") return } log.Fatal传入的是一个可变参数v ...interface{},并且可以传入任意类型,可变参数的使用和切片很像 如果要真的传入一个切片,那么切片类型要和参数类型一致 nums := []int{1, 2, 3, 4, 5} Fatal2(nums...) func Fatal2(args ...int) { for _, arg := range args { fmt.Println(arg) } } 完整代码: package main import ( "fmt" "log" "os" "runtime" ) func main() { //可变参数 Fatal("hello", 1) //如果要传切片,切片类型要和参数类型一致 nums := []int{1, 2, 3, 4, 5} Fatal2(nums...) host, _ := os.Hostname()

running a vbs file from java

大憨熊 提交于 2019-12-05 03:06:51
I have a VBS file test.vbs in C:/work/selenium/chrome/ and I want to run it from my Java program, so I tried this but with no luck: public void test() throws InterruptedException { Runtime rt = Runtime.getRuntime(); try { Runtime.getRuntime().exec( "C:/work/selenium/chrome/test.vbs" ); } catch( IOException e ) { e.printStackTrace(); } } If I try to run some exe file with this method it runs well, but when I try to run a VBS file it says "not a valid win32 application". Any idea how to run a VBS file from Java? A vbs-Script isn't natively executable like a bat, cmd or exe-Program. You have to

Linux上使用yum安装openjdk

孤街醉人 提交于 2019-12-05 02:48:48
来源: https://www.cnblogs.com/yaun1498078591/p/10368884.html 使用yum查找jdk: yum search java|grep jdk # yum search java|grep jdk ldapjdk-javadoc.noarch : Javadoc for ldapjdk java-1.6.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.6.0-openjdk-demo.x86_64 : OpenJDK Demos java-1.6.0-openjdk-devel.x86_64 : OpenJDK Development Environment java-1.6.0-openjdk-javadoc.x86_64 : OpenJDK API Documentation java-1.6.0-openjdk-src.x86_64 : OpenJDK Source Bundle java-1.7.0-openjdk.x86_64 : OpenJDK Runtime Environment java-1.7.0-openjdk-accessibility.x86_64 : OpenJDK accessibility connector java-1.7.0