I’m working with atmosphere trying to get the simple base implementation using atmosphere 2.0.3 tomcat 7.0.42 running locally in my eclipse environment (also connecting from external machine to see traffic with wireshark). The problem I am experiencing is no matter what transport I use, websocket, sse, …
Tag: java
Delete anything between “<” and “>” in a String
I have try restString = restString.replaceAll(“\<.*\>”, “”); and restString = restString.replaceAll(“\<[^(\>)]*\>”, “”);. Both seems don’t work. I don’t know if I could represent the meaning in the regular expression…
Java Fastest way to read through text file with 2 million lines
Currently I am using scanner/filereader and using while hasnextline. I think this method is not highly efficient. Is there any other method to read file with the similar functionality of this? Answer You will find that BufferedReader.readLine() is as fast as you need: you can read millions of lines a second w…
Can @Inject be made optional in JSR 330 (like @Autowire(required=false)?
Spring’s @Autowire can be configured such that Spring will not throw an error if no matching autowire candidates are found: @Autowire(required=false) Is there an equivalent JSR-330 annotation? @Inject always fails if there is no matching candidate. Is there any way I can use @Inject but not have the fra…
Why are 2 Long variables not equal with == operator in Java?
I got a very strange problem when I’m trying to compare 2 Long variables, they always show false and I can be sure they have the same number value by debugging in Eclipse: Both of above 2 return values are object-type Long, which confused me. And to verify that I wrote a main method like this: It prints…
java codility Frog-River-One
I have been trying to solve a Java exercise on a Codility web page. Below is the link to the mentioned exercise and my solution. https://codility.com/demo/results/demoH5GMV3-PV8 Can anyone tell what can I correct in my code in order to improve the score? Just in case here is the task description: A small frog…
org.glassfish.jersey.internal.RuntimeDelegateImpl NOT FOUND
I am using jersey for my project and tring to parse a URI from a string. The code is simple, but I get a error below It seems the program can not find the delegate. I already imported javax.ws.rs.core.UriBuilder and have jersey-common 2.0 that should contain the delegate in my build path. But I still get this…
How to write a function that can calculate power in Java. No loops
I’ve been trying to write a simple function in Java that can calculate a number to the nth power without using loops. I then found the Math.pow(a, b) class… or method still can’t distinguish the two am not so good with theory. So i wrote this.. Then i wanted to make my own Math.pow without u…
Partition a Set into smaller Subsets and process as batch
I have a continuous running thread in my application, which consists of a HashSet to store all the symbols inside the application. As per the design at the time it was written, inside the thread’s while true condition it will iterate the HashSet continuously, and update the database for all the symbols …
How to initialize and draw a Rectangle variable in a paintComponent method? [closed]
I’ve been trying to add collision to my game, it seemed like a piece of cake, I already know how to draw a rectangle. But I need that rectangle to be represented by something, a variable. But it seems …