【Java - 跨线程异常捕获】

1. 父线程无法通过try... catch 捕获到子线程的异常

2. 未捕获的子线程异常不会导致父线程中止，父线程无法感知到子线程的异常

3. 可以通过指定UncaughtExceptionHandler来捕获子线程的异常

4. UncaughtExceptionHandler运行在子线程中

示例如下：

public class TestMain {

	public static void main(String[] args) {
		Thread.setDefaultUncaughtExceptionHandler(new MyUnCaughtExceptionHandler());
		
		try {
			Integer.parseInt("101B");
		} catch (Exception e) {
			System.out.println("catch exception, e=" + e.getLocalizedMessage());
		}
		
		ExceptionThread thread = new ExceptionThread();
		try {
			thread.setName("testThread");
			thread.start();
		} catch (Exception e) {
			System.out.println("catch exception, e=" + e.getLocalizedMessage());
		}
		
		System.out.println("after subthread exception throwed, thread=" + Thread.currentThread().getId());
		
	}

	static class ExceptionThread extends Thread{
		@Override
		public void run() {
			System.out.println("ExceptionThread, threadid=" + Thread.currentThread().getId());
			Integer.parseInt("101A");
		}
	}
	
	static class MyUnCaughtExceptionHandler implements Thread.UncaughtExceptionHandler {
		@Override
		public void uncaughtException(Thread t, Throwable e) {
			System.out.println("uncaughtException, e=" + e.getLocalizedMessage() + ", thread=" + Thread.currentThread().getId());
		}
	}
}

运行结果：