java

问题 I am working on a chat application and Currently I am listening and emitting socket events in an Activity. Now i want to listen all the socket events even when chat activity is not in foreground as i want to store all the messages from different users in the local DB at the same time i want to update LiveData to update UI. In order to achieve this I am listening socket events in the Application class as following: public class ChatApplication extends Application { public Socket mSocket;

问题 I am working on a chat application and Currently I am listening and emitting socket events in an Activity. Now i want to listen all the socket events even when chat activity is not in foreground as i want to store all the messages from different users in the local DB at the same time i want to update LiveData to update UI. In order to achieve this I am listening socket events in the Application class as following: public class ChatApplication extends Application { public Socket mSocket;

问题 I am calling java.lang.Runtime.exec(...) in my Java program to run a command (some FFMPEG commands) simply passed to my function: private static void RunCommand(String command) throws InterruptedException { try { // Execute command Process proc = Runtime.getRuntime().exec(command); } } It runs OK for simple FFMPEG cases such as ffmpeg -i input.avi -c copy output.avi . But for one of the commands, apparently it doesn't run. When I copy/paste the exact String in command line, I am able to run

问题 I'm developing a Java Spring Boot application that needs to run on our client's Tomcat server. This application basically contains a REST API that serves files to our frontend. Running this application locally went great until our first deployment testing on the client's servers. We had to refactor our code and add some dependencies to the projects' pom.xml. This eventually worked (kind of). Now I wanted to again start developing locally and noticed my code wasn't able to run with the same

问题 I am drawing some objects on a JFrame such as circles, rectangles and arcs between them. I was wondering how I can implement an Undo button bearing in mind that the ones I found are targeted at text fields and writing in them. I don't have code to show and I wish to receive advice on how to implement it. Is it possible to 'register' the last event that occurred and then delete it? I have a very simple code about deleting the circles for instance. It works only for them and I know that it is

问题 I want to disable WebRTC in Chrome Driver, but can't figure out how to do it. I tried like this (found this solution in some blog): capabilities.setCapability("chrome.switches", Arrays.asList( "--disable-webrtc-multiple-routes", "--disable-webrtc-hw-encoding", "--disable-webrtc-hw-decoding", "--disable-webrtc-encryption")); It doesn't work. Yes, I know there isn't something like "--disable-webrtc" there, but it's all I have found about WebRTC, I mean, I didn't find some other WebRTC

问题 I am uploading files to a website using Selenium 2. I can upload one file by specifying the upload path, but I want to upload all files within a folder. Here's my code: if (driver.findElements(By.xpath("//input[@type='file']")).size() > 0) { driver.findElement(By.xpath("//input[@type='file']")).sendKeys("C:\\Users\\Bernard\\Dropbox\\Demo Submission\\Submissions\\Cooley - Imagination Land EP\\Cooley - Imagination Land.mp3"); } "Cooley - Imagination Land EP" is the folder that contains all the

问题 I'm looking to compute the highest ordinal enum value from a list of enum properties in a list of beans. For example, I have: @Data public class MyBean { private Priority priority; } and public enum Priority { URGENT("Urgent"), HIGH("High"), MEDIUM("Medium"), LOW("Low"); @Getter private final String value; Priority(String value) { this.value = value; } @Override public String toString() { return getValue(); } } If I have a List of MyBeans , how can I find the max ordinal value of the bean's

问题 I have just learned from this questions that Google app Engine now supports session. I would like to be able to use them but am not sure whether I should just because I can. Thanks to scalability issues. My questions are really, Where would I store the session information? In the data store or would this take to long? And surely far to costly? What about the mem cache? I have only known of GAE for a few days and am still reading. Is the Mem cache considered to be fast/scalable and does it

问题 I'm looking to compute the highest ordinal enum value from a list of enum properties in a list of beans. For example, I have: @Data public class MyBean { private Priority priority; } and public enum Priority { URGENT("Urgent"), HIGH("High"), MEDIUM("Medium"), LOW("Low"); @Getter private final String value; Priority(String value) { this.value = value; } @Override public String toString() { return getValue(); } } If I have a List of MyBeans , how can I find the max ordinal value of the bean's