Returns the default handler invoked when a thread abruptly terminates
due to an uncaught exception. If the returned value is {@code null},
there is no default.
@see #setDefaultUncaughtExceptionHandler
@return the default uncaught exception handler for all threads
Returns the default handler invoked when a thread abruptly terminates due to an uncaught exception. If the returned value is {@code null}, there is no default. @see #setDefaultUncaughtExceptionHandler @return the default uncaught exception handler for all threads