Why sleep() and yield() methods are defined as static methods in java.lang.Thread class? Answer The code would only execute when someXThread was executing, in which case telling someYThread to yield would be pointless. So since the only thread worth calling yield on is the current thread, they make the method…
Tag: multithreading
Tips to prevent deadlocks in java
I am studying java threads and deadlocks, I understand deadlock’s examples but I wonder if there are general rules to follow to prevent it. My question is if there are rules or tips that can be …
Thread Safe singleton class
I wrote a below Singleton class. I am not sure whether this is thread safe singleton class or not? Can anyone help me with this? Any thoughts on my above Singleton class will be of great help. Updated Code:- I am trying to incorporate Bohemian suggestion in my code. Here is the updated code, I got- Can anyone…
Java Thread Sleep and Interrupted Exception
Why does a sleep thread need a try catch to catch Interrupted Exception? Why does a sleep even emit an Interrupted Exception error? This are the two questions I really wanna find out about in java programming I’ve been searching through google and i’ve still haven’t found a clear explanation…
Designing a Guava LoadingCache with variable entry expiry
I am using Guava’s LoadingCache into my project to handle thread-{safe,friendly} cache loading and it works wonderfully well. However, there is a limitation. The current code defining the cache looks like this: I don’t specify an expiry time. The problem is that according to the values of the key,…
Run multi-thread at a time and make thread to run fast
I am trying to run two different threads at a time, but unable to do that. Thread_1 & Thread_2 runs, but difference between them is around 500ms. I am not using wait() or sleep() anywhere in my code. Questions: How to make run thread simultaneously or in parallel? How to make thread run fast? For second q…
What are worker threads, and what is their role in the reactor pattern?
I’m trying to understand the Reactor pattern (concurrent), but in many examples they are talking about ‘worker threads’. What are worker threads? In what way do they differ from ‘normal’ threads? And what is their role in the reactor pattern? Answer The Reactor pattern is used wi…
Thread interruptions are not caught by InterruptedException
I have a controller and a thread that does some work, the controller has an interrupt function that shuts off the threads in emergency situation. the skeleton of my code looks something like this: However, when interrupt is called, the InterruptedException is never caught. What am I doing wrong here? Answer T…
Updating the JavaFx Gui with threads and or Tasks
I am creating a chat program that contains a GUI that I have created in the new version of the JavaFx Scene builder. I have a main method that extends application and i have a simpleController (that controls all the buttons, labels, anchorPanes, etc) in my GUI. Other than that, I have a server application tha…
In Java, how to pass the objects back to Main thread from worker threads?
In Java, how to pass the objects back to Main thread from worker threads? Take the following codes as an example: How to pass the result back to main’s results[i] ? How about passing this to WorkerThread, so that it could Answer Why don’t you use Callables and an ExecutorService?