Convert a byte array to integer in Java and vice versa
Use the classes found in the java.nio namespace, in particular, the ByteBuffer. It can do all the work for you.
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Very Basic Java
Yes the problem is that you can only have one public class per file and this file should have the same name than the class. You can just remove the public in front of the definition of the first class. A better way to do would be to make it a static method of the main class. … Read more
SQLRecoverableException: I/O Exception: Connection reset
This simply means that something in the backend ( DBMS ) decided to stop working due to unavailability of resources etc. It has nothing to do with your code or the number of inserts. You can read more about similar problems here: http://kr.forums.oracle.com/forums/thread.jspa?threadID=941911 http://forums.oracle.com/forums/thread.jspa?messageID=3800354 This may not answer your question, but you will get an … Read more
Very Basic Java
Yes the problem is that you can only have one public class per file and this file should have the same name than the class. You can just remove the public in front of the definition of the first class. A better way to do would be to make it a static method of the main class. … Read more
What does java.lang.Thread.interrupt() do?
Thread.interrupt() sets the interrupted status/flag of the target thread. Then code running in that target thread MAY poll the interrupted status and handle it appropriately. Some methods that block such as Object.wait() may consume the interrupted status immediately and throw an appropriate exception (usually InterruptedException) Interruption in Java is not pre-emptive. Put another way both threads have to cooperate … Read more
How do I set the proxy to be used by the JVM
From the Java documentation (not the javadoc API): http://download.oracle.com/javase/6/docs/technotes/guides/net/proxies.html Set the JVM flags http.proxyHost and http.proxyPort when starting your JVM on the command line. This is usually done in a shell script (in Unix) or bat file (in Windows). Here’s the example with the Unix shell script: When using containers such as JBoss or WebLogic, my solution is to edit … Read more
Why nextLine() and not nextString() ?
Consider this: nextLine return everything until next endline (\n) in form of String. Would you not think that you will retrieve everything if it was called nextString? In that case you would be posting question “why nextString() stops at endline” tl;dr it’s because it searches for endline (\n) upd: on documenatation it refers to it … Read more
Integrate Ant builder into Eclipse: Error “Variable references empty selection”
Obviously, it has problems translating a reference to a variable (${project_path}) inside … a reference to a variable (${workspace_loc}). You could try the ${build_project} variable instead I hope it helps.
Good Java graph algorithm library?
If you were using JGraph, you should give a try to JGraphT which is designed for algorithms. One of its features is visualization using the JGraph library. It’s still developed, but pretty stable. I analyzed the complexity of JGraphT algorithms some time ago. Some of them aren’t the quickest, but if you’re going to implement them on … Read more
Why am I getting a “; expected” error?
You need to pass two int parameters into intPow(): Furthermore, you should probably return an int from intPow() so you can play with it later: Then in main():