In this Java executor tutorial you’ll learn how to use Executor, ExecutorService, ScheduledExecutorService and their thread pool implementations to effectively manage threads in a large scale application. Table of contents Java Executor API Java Executor interface Java ExecutorService interface Java ScheduledExecutorService interface Java Executor implementation classes Creating executors using Executors…
If hearing the term try-catch block is giving you an idea that you can have a try block and a single associated catch block then that is a wrong idea. You can have multiple catch blocks associated with a try block. In this post we’ll see examples of multiple catch…
If you have to read delimited file in Java and parse it then you can do it using the following two ways- 1- Using Scanner class with useDelimiter() method. 2- Read file using BufferedReader line by line and then split each line using split() method. Using Scanner class to read…
If you have to read input from console in Java there are 3 options. Using BufferedReader class. See example. Using Scanner class, available from Java 5. See example. Using System.console() method, available from Java 6. See example. Using BufferedReader class By wrapping the standard input stream “System.in” in an InputStreamReader…
In this post we’ll see what is volatile keyword in Java, when to use volatile variable and what is the reason for declaring variable as volatile. Table of contents What is volatile keyword in Java How declaring variable as volatile in Java helps Volatile Java example code Volatile ensures reordering…
In a multi-threaded environment a shared object would need synchronization to avoid corruption through concurrent access, but synchronization is expensive. Another alternative is to give each thread its own instance and avoid sharing of data. That’s what ThreadLocal class in Java does. ThreadLocal class in Java provides thread local variables…
In this post we’ll see the difference between sleep() and yield() methods in Java. Since both of these methods sleep() and yield() cause the currently executing thread to suspend its execution some users find it confusing to differentiate between sleep and wait methods. So let’s try to see the difference…
In this post we’ll see the difference between sleep() and wait() methods in Java. Since both of these methods sleep() and wait() cause the currently executing thread to suspend its execution some users find it confusing to differentiate between sleep and wait methods. So let’s try to see the difference…
Thread.sleep() method in Java multi-threading causes the currently executing thread to suspend execution for a specified period. In Java Thread class there are two overloaded sleep() methods- static void sleep(long millis) throws InterruptedException– Causes the currently executing thread to sleep for the specified number of milliseconds. static void sleep(long millis,…
In your application you may have a scenario where you spawn a bunch of threads to execute some logic and you want to start any further processing only after all the threads have finished the execution. Which means you need some way to know whether a thread is terminated or…
