exception-handling

问题 I am wondering if there is any difference between the MIPS syscall and trap instructions. I can't find anything involving this, so I am not sure if there is a difference. Traps seem to just be a conditional syscall, but some clarifying can be helpful. 回答1: The SYSCALL and TRAP instructions both trigger exceptions, but the resulting exception is of a different type (SystemCall versus Trap), and the operating system will likely handle them differently. 回答2: A Trap is an exception switches to

问题 I am wondering if there is any difference between the MIPS syscall and trap instructions. I can't find anything involving this, so I am not sure if there is a difference. Traps seem to just be a conditional syscall, but some clarifying can be helpful. 回答1: The SYSCALL and TRAP instructions both trigger exceptions, but the resulting exception is of a different type (SystemCall versus Trap), and the operating system will likely handle them differently. 回答2: A Trap is an exception switches to

问题 I'm writing an exception clause at the top level of a script, and I just want it to log whatever errors occur. Annoyingly, PyCharm complains if I just catch Exception . import logging logging.basicConfig() try: raise RuntimeError('Bad stuff happened.') except Exception: # <= causes warning: Too broad exception clause logging.error('Failed.', exc_info=True) Is there something wrong with this handler? If not, how can I tell PyCharm to shut up about it? 回答1: From a comment by Joran: you can use

问题 In my custom exception class I've overridden toString() : @Override public String toString() { final String msg = getLocalizedMessage(); // base String str = getClass().getName() + ": [" + code + "]"; // message if (msg != null) str += " " + msg; // extra if (extra != null) { str += '\n' + extra.toString(); } return str; } (yes, I'm aware I should use StringBuilder there) However, when I log such an exception (via org.slf4j.Logger.warn(String msg, Throwable err) ) the output is as for vanilla

问题 In my custom exception class I've overridden toString() : @Override public String toString() { final String msg = getLocalizedMessage(); // base String str = getClass().getName() + ": [" + code + "]"; // message if (msg != null) str += " " + msg; // extra if (extra != null) { str += '\n' + extra.toString(); } return str; } (yes, I'm aware I should use StringBuilder there) However, when I log such an exception (via org.slf4j.Logger.warn(String msg, Throwable err) ) the output is as for vanilla

问题 Is it possible to create custom conditions when I raise an exception? Consider the following example: BEGIN y := x / 0; EXCEPTION WHEN division_by_zero THEN RAISE NOTICE 'caught division_by_zero'; RETURN x; END; Here I use 'division_by_zero' condition to catch the exception. What I'd like to do is something like this: BEGIN [...] RAISE custom_condition; EXCEPTION WHEN custom_condition THEN [...] END; so that I don't interfere with possible standard exceptions. I could just do y:= 1 / 0; and

问题 I've seen below code in one of the video tutorial.There its executes fine but while I'm trying to execute in my system, it is compiling fine but I'm getting runtime error saying, Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 class Test13 { public static void main(String[] args) { int i = Integer.parseInt(args[0]); System.out.println(i); } } Can someone please guide me what's wrong with this code and how to rectify? Thanks in advance! 回答1:

问题 I've seen below code in one of the video tutorial.There its executes fine but while I'm trying to execute in my system, it is compiling fine but I'm getting runtime error saying, Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 class Test13 { public static void main(String[] args) { int i = Integer.parseInt(args[0]); System.out.println(i); } } Can someone please guide me what's wrong with this code and how to rectify? Thanks in advance! 回答1:

问题 Consider the following code. class C {} /** * @throws \InvalidArgumentException */ function classCreateInstance($class) { if (!is_string($class)) { throw new \InvalidArgumentException("Class name must be a string."); } if (!class_exists($class)) { throw new \InvalidArgumentException("Class '$class' does not exist."); } return new $class(); } /** * @return C */ function foo() { return classCreateInstance(C::class); } There is one function that may throw an exception, because it does not know

问题 Consider the following code. class C {} /** * @throws \InvalidArgumentException */ function classCreateInstance($class) { if (!is_string($class)) { throw new \InvalidArgumentException("Class name must be a string."); } if (!class_exists($class)) { throw new \InvalidArgumentException("Class '$class' does not exist."); } return new $class(); } /** * @return C */ function foo() { return classCreateInstance(C::class); } There is one function that may throw an exception, because it does not know