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Tag: java

synchronize two threads in java

I have two threads in my java programme, one is main thread and other thread is thread A which is spawned in main thread. now i want main thread to start thread A and wait till thread A has executed some part of its code in run method and thread A should suspend itself. main thread should then start running,

How to set JAVA_HOME in Linux for all users

I am new to Linux system and there seem to be too many Java folders. java -version gives me: java version “1.7.0_55” OpenJDK Runtime Environment (rhel-2.4.7.1.el6_5-x86_64 u55-b13) OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode) When I am trying to build a Maven project , I am getting error: Could you please tell me which files I need to modify

Assets folder in Android Studio Unit Test

I have a Gradle project with the following structure: Now I want to add a unit test which uses a resource (either “raw” or “asset”). I put my resource into project/androidTest/assets/test_file and access it with getContext().getResources().getAssets().open(“test_file”); (in an AndroidTestCase). However, this gives me a FileNotFoundException. How can I fix this? Answer It looks like you’re trying to create an instrumented

What is the difference between concatMap and flatMap in RxJava

It seems that these 2 functions are pretty similar. They have same signature (accepting rx.functions.Func1<? super T, ? extends Observable<? extends R>> func), and their marble diagrams look exactly same. Can’t paste the pics here, but here’s one for concatMap, and here’s one for flatMap. There seems to be some subtle difference in the description of resulting Observable, where one

Knights tour – results in an infinite loop and i can’t figure out why

I’m trying to solve the knight’s tour problem using backtracking. I think the algorithm I have should work. I’ve tried but I can’t figure out why it isn’t working. It results in an infinite loop. However if I comment out the line that back track solutionBoard[dst.x][dst.y]=-1; it works! I just don’t understand why! Any help would be appreciated. Answer Your

Adding linebreak in xml file before root node

I am trying to add line break after my comments above the root node in XML document. I need something like this: But What I was able to get is this(Line break inside the root but I need line break after the comment): I need to add the line break just after my comment. Is there a way to do

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