捕获运行线程中的异常

A线程调用B线程，B线程发生异常，A怎么知道B线程发生异常了

public class Demo {

    public static void main(String[] args) throws Exception, SecurityException {

        Thread t = new Thread(() -> {
            // int i = 1 / 0;
            //这里只能抛出运行时异常，如果是检查异常，会提示try-catch
            throw new RuntimeException("发生异常了");

        });

        t.setUncaughtExceptionHandler(new UncaughtExceptionHandler() {
            @Override
            public void uncaughtException(Thread t, Throwable e) {
                System.out.println(t.getName());
                System.out.println(e.getMessage());
            }
        });
        t.start();
    }

}