runtime

问题 In my business, I will to dynamically create model and repository for MySQL. I have successfully create the java file and complied it. then register the bean for repository and service using beanfactory. But I don't have an idea about how to map the Entity. I have searched some similar questions but do not have a clean solution. can anyone help and show me some code samples ? 回答1: JPA works mostly with static schema. There are good reasons for this, see discussion on www.java.net/node/666078

问题 I have the following algorithm and the runtime complexity is O(N^2) but I want to have a deeper understanding of it rather than just memorizing common runtimes. What would be the right approach to break it down and analyze it with i+1 in the inner for loop taken into account? void printunorderedPairs(int[] array) { for(int i=0; i<array.length; i++) { for(int j=i+1; j<array.length; j++) { System.out.println(array[i] + "," + array[j]); } } } EDIT Asking for how to analyze a specific question

问题 how set HttpPostedFileBase ContentType value in runtime? HttpPostedFileBase upl=null; string path="/exelFile/book1.xlsx"; //-----Set Name Runtime var Name="FileName.xlsx"; //-----Set Type Runtime var type="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; byte[] bytes =System.IO.File.ReadAllBytes(Server.MapPath(Path)); upl = (HttpPostedFileBase)new MemoryPostedFile(bytes, Name); //=====>how set type upl.ContentType //============== 回答1: Many thanks to @StephenMuecke. By

问题 I use broadcastreceiver of media folder android.hardware.action.NEW_PICTURE service to rename and move image using this code and it was running: CameraReciver package perim.ebrahimi.ir.perim; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.database.Cursor; public class CameraReciver extends BroadcastReceiver { private States states; private SessionManager session; private WriteService main; @Override public void onReceive

问题 I am new to Android and while I am building project I am getting this type of error: Failed to complete Gradle execution cause: org/gradle/Internal/TrueTimeProvider I searched a lot through Google and Stack Overflow but no help. 回答1: Try performing a clean build from build->clean project 回答2: Download any gradle of version greater than 3.2 link : https://services.gradle.org/distributions/ Extract it and save it in a suitable place in your computer. Open android studio and open settings. File-

问题 I am trying to run an hadoop jar command from JAVA using Runtime.exec. Below is the sample code: Runtime.getRuntime().exec(new String[]{"bin/hadoop", "jar /home/hadoop/jar/test.jar /user/hduser/myinput/input /user/hduser/newoutput"}); However I am not getting the desired output. Below is my hadoop command which I want to execute from JAVA: bin/hadoop jar /home/hadoop/jar/test.jar /user/hduser/myinput/input /user/hduser/newoutput I am not getting any exception as well. Is the way Runtime

问题 I have a simple program that takes a text file as input and runs kandanes algorithm on it. It compiles fine but I get this error when I try and run it: Error: Could not find or load main class a1_13132334 It compiles and runs fine on netbeans ide and their is a class file there but it won't run from the command line. Here is the program: import java.io.*; public class a1_13132334 { public static void main(String [] args) throws IOException { //make sure the user entered a single text file if

问题 I am trying to deploy an application that is using Jackson, JUnit, and Commons-IO. I have the following Jars in my application's classpath: commons-io-2.4.jar jackson-databind-2.7.0.jar jackson-annotations-2.7.0.jar log4j-api-2.4.1.jar wsdiscovery-0.2.jar jackson-core-2.7.0.jar log4j-core-2.4.1.jar This application works within my development environment, and I have deployed all of the above Jars with the main application jar. I can run the application without problems, but every time I try

问题 I'm using EF4 in model (DB First), POCO in entities, ASP.Net in UI. I have a Biz layer of course. I need to design dynamic form generator. I decide to create a table from forms design by users, and then update my EF model in runtime, generate POCO objects and biz logic in runtime, and then compile them in runtime. I have problem about updating model in runtime. any help? Thanks in advance -Hamid 回答1: EF is not tool for your problem! EF is build around simple concept - mapping and classes are

问题 I've been trying to increase the speed of some code. I've removed all loops, am using vectors and have streamed lined just about everything. I've timed each iteration of my code and it appears to be slowing as iterations increase. ### The beginning iterations user system elapsed 0.03 0.00 0.03 user system elapsed 0.03 0.00 0.04 user system elapsed 0.03 0.00 0.03 user system elapsed 0.04 0.00 0.05 ### The ending iterations user system elapsed 3.06 0.08 3.14 user system elapsed 3.10 0.05 3.15