Tag: concurrency
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1. Java sleep() and wait() – Discussion sleep() is a method which is used to pause the process for few seconds or the time we want to. But in case of wait() method, thread goes in waiting state and it won’t come back automatically until we call the notify() or notifyAll(). The major difference is that wait() releases the lock or monitor while sleep() doesn’t…
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1. Create Thread using Runnable Interface vs Thread class Let’s quickly check the java code of usage of both techniques. 1.1. Runnable interface Java program to create thread by implementing Runnable interface. public class DemoRunnable implements Runnable { public void run() { //Code } } //start new thread with a “new Thread(new demoRunnable()).start()” call 1.2. Thread class…
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In this post, we are going to discuss thread priorities in detail and the different types of thread priorities in Java, and how a thread scheduler executes various threads based on their priorities. We will also see how we can set thread priority of a thread and how we can get the priority of an existing thread. 1. Introduction to…
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There is no official method to kill a thread in Java. Stopping a thread is entirely managed by the JVM. Although Java provides several ways to manage the thread lifecycle such as a start(), sleep(), stop() (deprecated in Java 1.1), etc. but does not provide any method to kill a thread and free the resources cleanly. Oracle specified the reason for deprecating the…
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In simple words, concurrency is the ability to run several programs or several parts of a program in parallel. Concurrency enables a program to achieve high performance and throughput by utilizing the untapped capabilities of the underlying operating system and machine hardware. For example, modern computers have several CPUs or several cores within one CPU, the program…
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1. ConcurrentHashMap class The ConcurrentHashMap is very similar to the HashMap class, except that ConcurrentHashMap offers internally maintained concurrency. It means we do not need to have synchronized blocks when accessing its key-value pairs in a multithreaded application. //Initialize ConcurrentHashMap instance ConcurrentHashMap<String, Integer> m = new ConcurrentHashMap<>(); //Print all values stored in ConcurrentHashMap instance for each (Entry<String, Integer> e : m.entrySet()) { system.out.println(e.getKey()+”=”+e.getValue()); } The…