I have a function which is in the form of probability distribution function as below: Although I discover some lib providing function to obtain the result as the above formula would do; but I am learning to implement it so I would like to do it my self if possible. Below is what I can think of when implementing the function public double pdf(double x){ double mean = mean(); double vari
我有一个以概率分布函数形式的函数，如下所示： 虽然我发现一些lib提供函数来获得上述公式所做的结果; 但我正在学习实施它，所以如果可能的话，我想尽我所能。 以下是我在实现该功能时可以考虑的内容 public double pdf(double x){ double mean = mean(); double variance = variance(); double base = 1/Math.sqrt(2*Math.PI*variance); double pow = -(Math.pow((x-mean), 2)/2*variance); return Math.pow(ba
This question already has an answer here: Does java really have pointers or not? [closed] 9 answers You already mentioned the security reason yourself. Java program runs in container named Java Virtual Machine (JVM) that controls the memory management. This means that program cannot directly access memory for security and stability reasons: java program cannot damage memory of other proces
这个问题在这里已经有了答案： java真的有指针吗？ [已完成] 9个答案 你已经提到了自己的安全原因。 Java程序在名为Java Virtual Machine（JVM）的容器中运行，该容器控制内存管理。 这意味着出于安全性和稳定性原因，程序不能直接访问内存：Java程序不能损害其他进程的内存。 其他原因是垃圾收集。 像C ++一样Java有一个new关键字，它为新对象分配内存。 但是java没有delete 。 不能再使用的对象的移除由GC自动完成
I know Java doesn't have pointers, but I heard that Java programs can be created with pointers and that this can be done by the few who are experts in java. Is it true? All objects in Java are references and you can use them like pointers. abstract class Animal {... } class Lion extends Animal {... } class Tiger extends Animal { public Tiger() {...} public void growl(){...} } Tiger
我知道Java没有指针，但我听说可以用指针创建Java程序，并且这可以由少数几个java专家来完成。 这是真的吗？ Java中的所有对象都是引用，你可以像指针一样使用它们。 abstract class Animal {... } class Lion extends Animal {... } class Tiger extends Animal { public Tiger() {...} public void growl(){...} } Tiger first = null; Tiger second = new Tiger(); Tiger third; 解引用null： first.growl(); //
I wanted to add some actions to my spinner (as you can see in my code below, I added some Toasts ). MainActivity.java: public class MainActivity extends Activity implements AdapterView.OnItemSelectedListener { String[] items = {"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
我想给我的spinner添加一些动作（正如你可以在我的代码中看到的，我添加了一些Toasts ）。 MainActivity.java： public class MainActivity extends Activity implements AdapterView.OnItemSelectedListener { String[] items = {"Item 1", "Item 2", "Item 3", "Item 4", "Item 5"}; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setCo
I am attempting to use a custom font for a TextView on Android, following the guide here and here. Using the same font, same code, same everything, I get this in adb logcat: W/dalvikvm( 317): threadid=1: thread exiting with uncaught exception (group=0x4001d800) E/AndroidRuntime( 317): FATAL EXCEPTION: main E/AndroidRuntime( 317): java.lang.RuntimeException: Unable to start activity Componen
我试图在Android上使用TextView的自定义字体，按照这里和这里的指南。 使用相同的字体，相同的代码，相同的一切，我在adb logcat中得到这个： W/dalvikvm( 317): threadid=1: thread exiting with uncaught exception (group=0x4001d800) E/AndroidRuntime( 317): FATAL EXCEPTION: main E/AndroidRuntime( 317): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.evilx.quacklock/org.evilx.quack
I am having a problem uploading a docx file. It looses 2 bytes after I upload and save it to the server. Here is my code. <cffunction name="akamaiUpload" access="private" output="false"> <cfargument name="filename" type="string" required="true"> <cfargument name="localpath" type="string" required="true"> <cftry> <cfhttp url="http://sample.com/#a
我在上传docx文件时遇到问题。 上传并保存到服务器后，它丢失2个字节。 这是我的代码。 <cffunction name="akamaiUpload" access="private" output="false"> <cfargument name="filename" type="string" required="true"> <cfargument name="localpath" type="string" required="true"> <cftry> <cfhttp url="http://sample.com/#arguments.filename#" method="post">
Recently posted a question regarding the HttpClient over Https (found here). I've made some headway, but I've run into new issues. As with my last problem, I can't seem to find an example anywhere that works for me. Basically, I want my client to accept any certificate (because I'm only ever pointing to one server) but I keep getting a javax.net.ssl.SSLException: Not trusted se
最近通过https发布了一个关于HttpClient的问题（在这里找到）。 我取得了一些进展，但我遇到了新的问题。 和我最后一个问题一样，我似乎无法在任何地方找到适合我的例子。 基本上，我希望我的客户端接受任何证书（因为我只是指向一台服务器），但我不断收到javax.net.ssl.SSLException: Not trusted server certificate exception. 所以这就是我所拥有的： public void connect() throws A_WHOLE_BUNCH_OF_EXCEPTIONS {
I'm fairly new to HTTPS/SSL/TLS and I'm a bit confused over what exactly the clients are supposed to present when authenticating with certificates. I'm writing a Java client that needs to do a simple POST of data to a particular URL. That part works fine, the only problem is it's supposed to be done over HTTPS. The HTTPS part is fairly easy to handle (either with HTTPclient or
我对HTTPS / SSL / TLS相当陌生，我对使用证书进行身份验证时客户端应该呈现的内容感到困惑。 我正在编写一个Java客户端，需要对特定的URL执行简单的POST数据POST。 这部分工作正常，唯一的问题是它应该通过HTTPS完成。 HTTPS部分相当容易处理（使用HTTPclient或使用Java的内置HTTPS支持），但我坚持使用客户端证书进行身份验证。 我注意到在这里已经有一个非常类似的问题，我还没有用我的代码尝试过（将尽快完成）。 我目
My goal is to do a couple things: Use OpenCV and the JavaCameraView to process frames from the phone's camera feed Enable recording of that processed video as it happens I have both of them working, but the way I had to implement number 2 is ridiculous: For each frame, write the processed Mat as an image file. When the recording stops, use JCodec's Android library to stitch them
我的目标是做一些事情： 使用OpenCV和JavaCameraView来处理来自手机摄像头的帧 在处理视频发生时启用录制 我有他们两个工作，但我不得不实施第2号的方式是荒谬的： 对于每个帧，将处理后的Mat写入图像文件。 当录制停止时，使用JCodec的Android库将它们拼接成一个视频文件。 这很有效，但它带来了很多缺点：在录制过程中，帧速率降低到难以忍受的程度，并且拼接步骤每帧需要大约半秒，并且视频耗尽时间超过几秒钟 -
I'm creating a Swing application where the user should be able to edit JavaScript codes. So I need some kind of code editor embeddable in Java that supports: Customizable Auto-Completion (or if not already done, extensible enough to be easily implementable) Syntax Errors Highlight (like Netbeans or other advanced editors that can mark the lines with syntax problems) Color Syntax Highli
我正在创建一个Swing应用程序，用户应该可以编辑JavaScript代码。 所以我需要一些可嵌入Java的代码编辑器来支持： 可自定义的自动完成（如果尚未完成，可扩展性足以轻松实现） 语法错误突出显示（如Netbeans或其他高级编辑器，可以标记带语法问题的行） 彩色语法突出显示（不是非常关键） 它可以嵌入到Java中的需求主要是因为自动完成将是动态的，并且非常专用于应用程序。 这种编辑器是否存在？ RSyntaxTextArea支