Java thread asynchronous programming practice

Java thread asynchronous programming is implemented by creating an asynchronous thread, using the submit() method to create and the get() method to obtain the task results. Benefits include improved application performance, increased concurrency, and improved responsiveness.

Java thread asynchronous programming practice

Introduction

Asynchronous programming is a A programming paradigm that allows a program to continue execution without waiting for results. In Java, asynchronous programming can be implemented using threads.

Creating an asynchronous thread

To create an asynchronous thread, you can use the ExecutorService interface and its submit() method:

ExecutorService executor = Executors.newFixedThreadPool(10);
Future<String> future = executor.submit(() -> {
    // 异步任务
    return "任务结果";
});

submit() The method returns a Future object that represents the result of the asynchronous task.

Get the asynchronous task results

You can use the get() method of the Future object to get the results of the asynchronous task:

String result = future.get();

get() method blocks the thread until the asynchronous task is completed.

Practical case

Asynchronous file processing

Suppose we have a file containing multiple lines of text, and we need to do it line by line deal with them. We can use asynchronous threads to process each line in the file in parallel:

ExecutorService executor = Executors.newFixedThreadPool(10);
try (BufferedReader reader = new BufferedReader(new FileReader("file.txt"))) {
    List<Future<String>> futures = new ArrayList<>();
    String line;
    while ((line = reader.readLine()) != null) {
        futures.add(executor.submit(() -> {
            // 处理每一行
            return line.toUpperCase();
        }));
    }
    List<String> results = new ArrayList<>();
    for (Future<String> future : futures) {
        results.add(future.get());
    }
}

In this example, we use BufferedReader to read each line in the file. For each row, we create an asynchronous task to process the row. Then, we use the get() method to get the results of each task.

Advantages

• Improve application performance
• Increase concurrency
• Improve responsiveness

The above is the detailed content of Java thread asynchronous programming practice. For more information, please follow other related articles on the PHP Chinese website!