runtime | 易学教程

how to run cygwin script from java

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问题 I'm trying to run a bash script from a Java program I'm writing in windows. I've been trying to use the Runtime object to get a process to work, and my program compiles and runs without exceptions, but my simple test script, which just makes a directory, is not being executed. Here's what I've got so far: String cmmd[] = new String[3]; cmmd[0] = "C:\\cygwin\\bin\\bash.exe"; cmmd[1] = "cd C:/Users/pro-services/Desktop/projects/github/cygwin"; cmmd[2] = "bash TEST.sh"; Runtime rt= Runtime

Reflection without a Getter/Setter?

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问题 If I declare the following in my class: private int? MyID = null; And then attempt to access it via reflection, it won't be able to find it. What I mean by that is, the below will set gProp to null: gType = refObj.GetType(); gProp = gType.GetProperty(PropertyName, System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance); However, it will work fine if I instead declare it as: private int? MyID { get; set; } This isn't at all

Android, updating view in realtime overlapping old view

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问题 I'm having an issue when trying to update a progress bar. When I update the progress bar, its as if the updated view draws over the current view. Even when I'm getting the view by ID. I would of assumed that it is updating the current view so whats currently there should be discarded. Changing progress from 80 to 30 to 25 for example turns out like below: http://i.stack.imgur.com/UnUvA.png The below is called numerous times. the cursor.getInt(4) will return different values based on what the

GCC flags to improve run-time error catching?

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问题 I've recently ported a Linux C++ application to Windows (via Visual Studio 2010 C++ express). In the process I've noticed the Windows executable tends to pick up on subtle bugs in my code, crashing the program. But the same code and bug seems to go unnoticed in Linux/GCC and the program will continue running happily. I've seen this behaviour in past programs I tried to port. An example bug in my code is writing pass an array by 1 element. What flags can I enable to improve run-time error

Excel visual basic 1004 error, method 'value' of object 'range' failed

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问题 I made a little add-in for excel. But for some reason it fails. After a fresh startup of excel it works fine, however when I copy paste text into excel and try to run it, it gives me the error: run-time '1004' , method 'Value' of object 'range' failed. What I'm trying to do, is quit simple. I like building formula's like : (B5+B6)/2 without the use of an '=' in front so Excel doesn't calculate these expressions. I end up with one big column, and after I am finished I would like to select the

Choose between muliple transaction managers at runtime

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问题 I have 2 clients using same Spring based REST Application deployed in tomcat. Depending on client I need to choose between data sources and transaction manager. How do I choose at runtime, which transaction manager to use? <bean id="First_dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="url" value="${First_jdbc.url}" /> <property name="driverClassName" value="${First_jdbc.driverClassName}" /> <property name="username" value="${First_jdbc

JVE、JDK之间的关系

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JDK（Java Development Kit）是针对Java开发员的产品，是整个Java的核心，包括了Java运行环境JRE、Java工具和Java基础类库。Java Runtime Environment（JRE）是运行JAVA程序所必须的环境的集合，包含JVM标准实现及Java核心类库。JVM是Java Virtual Machine（Java虚拟机）的缩写，是整个java实现跨平台的最核心的部分，能够运行以Java语言写作的软件程序。　　　　　　在计算机开发语言的历史中，从来没有哪种语言象Java那样受到如此众多厂商的支持，有如此多的开发工具。　　　　JDK（Java Development Kit）　　JDK是Java开发工具包，是Sun Microsystems针对Java开发员的产品。　　JDK中包含JRE，在JDK的安装目录下有一个名为jre的目录，里面有两个文件夹bin和lib，在这里可以认为bin里的就是jvm，lib中则是jvm工作所需要的类库，而jvm和 lib和起来就称为jre。　　JDK是整个JAVA的核心，包括了Java运行环境JRE（Java Runtime Envirnment）、一堆Java工具（javac/java/jdb等）和Java基础的类库（即Java API 包括rt.jar）。　　①SE(J2SE)，standard

Java look and feel at runtime

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问题 I have a basic GUI (plain Jframe with a button) and I have changed the look and feel using Nimrod. The new l&f is a dark theme which I change at runtime. However, when the GUI is run, for a very brief moment, the GUI has a bright background, and then the new dark l&f is then applied. I assume what is causing this brief flash of brightness is that at runtime, the default l&f is showing briefly, just before the new one is being applied. It's only a fraction of a second, but it's noticeable and

Java - creating threads in a EventListener

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问题 I got this code: Thread thread = new Thread(new Runnable() { @Override public void run() { OctopusWSClient.sendPoolSensorReading(poolSensorReading, OctopusClientStart.currentMacAddress); } }); thread.setName("Thread - WS"); thread.start(); Is inside a Event Listener that is executing approximately every 30 seconds (When an event occurs), so is creating a new Thread every 30 seconds that usually last 20 seconds to complete, now, my question is... Its OK to call Threads this way?, if not, how??

Creating dcheckbox dynamically in Java-NetBeans

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问题 I am developing a simple "To-do List" application which involves obtaining 'things to do' for a particular day from the database and displaying them as checkbox text on a panel resting on a frame.There is a button "done" which can be used to remove the ticked checkboxes after a task is complete. The code that I used for the dynamic creation of the checkboxes is shown below: //cnt-variable used to store the number of tasks for a day //rs1-ResultSet variable into which the task description is