Exception handling in Java multi-threaded environment

Key points of exception handling in a multi-threaded environment: Catching exceptions: Each thread uses a try-catch block to catch exceptions. Handle exceptions: print error information or perform error handling logic in the catch block. Terminate the thread: When recovery is impossible, call Thread.stop() to terminate the thread. UncaughtExceptionHandler: To handle uncaught exceptions, you need to implement this interface and assign it to the thread. Practical case: exception handling in the thread pool, using UncaughtExceptionHandler to handle uncaught exceptions.

Exception handling in Java multi-threaded environment

The essence of multi-threaded programming is to execute multiple tasks concurrently, which is inevitable The land will encounter unusual circumstances. Handling exceptions in a multi-threaded environment is very different from a single-threaded environment and requires special attention.

Handling thread exceptions

In a multi-threaded environment, each thread has its own execution stack and local variables, so exceptions thrown by one thread will not affect other threads. To handle thread exceptions, you can use the following steps:

1. In each thread's code, use a try-catch block to catch exceptions.
2. In the catch block, print error information or perform other error handling logic.
3. If the thread cannot recover from the exception, you can call the Thread.stop() method to terminate the thread.

Sample code:

public class ThreadExceptionHandler implements Runnable {
    public void run() {
        try {
            // 执行可能抛出异常的代码
            
        } catch (Exception e) {
            System.out.println("Caught exception in thread: " + Thread.currentThread().getName());
            e.printStackTrace();
            // 执行错误处理逻辑
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Thread thread1 = new Thread(new ThreadExceptionHandler());
        Thread thread2 = new Thread(new ThreadExceptionHandler());
        
        thread1.start();
        thread2.start();
    }
}

UncaughtExceptionHandler

Except try-catch block , Java also provides the UncaughtExceptionHandler interface to handle uncaught exceptions. When a thread throws an exception and there is no try-catch block to catch it, UncaughtExceptionHandler will be called.

To use UncaughtExceptionHandler, you need to perform the following steps:

1. Implement the UncaughtExceptionHandler interface.
2. Assign a custom exception handler to each thread.
3. In the uncaughtException() method, you can print error information or perform other error handling logic.

Practical case

A common practical case is to handle exceptions in the thread pool. Thread pool is a mechanism for managing threads, which can automatically create and destroy threads. When a thread in a thread pool throws an exception, UncaughtExceptionHandler will be used to handle the exception.

Sample code:

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ThreadPoolExceptionHandler implements UncaughtExceptionHandler {
    public void uncaughtException(Thread t, Throwable e) {
        System.out.println("Caught uncaught exception in thread: " + t.getName());
        e.printStackTrace();
    }
}

public class Main {
    public static void main(String[] args) {
        ExecutorService executorService = Executors.newFixedThreadPool(10);
        executorService.setUncaughtExceptionHandler(new ThreadPoolExceptionHandler());
        
        // 提交许多任务到线程池
        
        executorService.shutdown();
    }
}

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