【Java成神之路】主线程可以捕获到子线程的异常吗？

2022-03-08 16:20:36  晓掌柜  版权声明：本文为站长原创文章，转载请写明出处

一、结论

    正常情况下，如果不做特殊的处理，在主线程中是不能够捕获到子线程中的异常的。
    如果想要在主线程中捕获子线程的异常，我们需要使用ExecutorService，同时做一些修改。

二、代码示例

package com.xa.demo.theadexceptiondemo;
 
import com.sun.glass.ui.TouchInputSupport;
 
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
 
public class ThreadExceptionDemo {
    public static void main(String[] args) {
        try {
            Thread thread = new Thread(new ThreadExceptionRunner());
            thread.start();
        } catch (Exception e) {
            System.out.println("========");
            e.printStackTrace();
        } finally {
        }
        System.out.println(123);
        ExecutorService exec = Executors.newCachedThreadPool(new HandleThreadFactory());
        exec.execute(new ThreadExceptionRunner());
        exec.shutdown();
    }
}
 
class MyUncaughtExceptionHandle implements Thread.UncaughtExceptionHandler {
    @Override
    public void uncaughtException(Thread t, Throwable e) {
        System.out.println("caught " + e);
    }
}
 
class HandleThreadFactory implements ThreadFactory {
    @Override
    public Thread newThread(Runnable r) {
        System.out.println("create thread t");
        Thread t = new Thread(r);
        System.out.println("set uncaughtException for t");
        t.setUncaughtExceptionHandler(new MyUncaughtExceptionHandle());
        return t;
    }
}