How to Write Concurrent Programs Using CompleteFuture in Java

CompleteFuture is a concurrent programming framework introduced in Java 8 to simplify asynchronous programming and the processing of concurrent tasks. It provides a set of methods that can be used to manage the execution of asynchronous tasks, processing of results, task combinations, and exception handling. The main methods are: 1. 'runAsync (Runnable runnable)': Submit an asynchronous task that does not return a result and return a CompleteFuture instance. Example code: CompletableFuture<Void> future = CompletableFuture.runAsync(() -> { //Specific logic of asynchronous tasks }); 2. 'supplyAsync (Supplier<U>supplier)': Submit an asynchronous task that returns a result and returns a CompleteFuture instance. Example code: CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> { //Specific logic of asynchronous tasks return "Hello, World!"; }); 3. 'thenApply (Function<T, U>fn)': After a CompleteFuture is completed, its results can be converted. Returns a new CompleteFuture instance. Example code: CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> { //Specific logic of asynchronous tasks return "Hello"; }).thenApply(result -> { //Process the results return result + ", World!"; }); 4. 'thenAccept (Consumer<T>action)': After a CompleteFuture is completed, it is possible to consume its results, but no results are returned. Example code: CompletableFuture.supplyAsync(() -> { //Specific logic of asynchronous tasks return "Hello"; }).thenAccept(result -> { //Consume the results System.out.println(result + ", World!"); }); 5. 'thenRun (Runnable Action)': When a CompleteFuture is completed, an operation can be executed without caring about the results of the previous CompleteFuture. Example code: CompletableFuture.supplyAsync(() -> { //Specific logic of asynchronous tasks return "Hello"; }).thenRun(() -> { //Execute Action System.out.println("The task has completed."); }); If you need to use CompleteFuture, simply add the following Maven dependencies in the 'pom. xml' file of the project: <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> <version>3.11</version> </dependency> Then, you can use CompleteFuture in the code.