exception

问题 For my final in Java we have a "exceptions" part on the test with try, catch, and finally calls. When I try to put the example code into Eclipse I get errors in the catch and throw new areas. All of the errors say "Can not be resolved to type". How do I fix this so I can learn/review what the code is supposed to be doing? Q4 Class public static void main(String [] args) { Q4Exception q1 = new Q4Exception(); try{ q1.sampleMethod(); try{ q1.sampleMethod(); } //This catch does not throw an error

问题 For my final in Java we have a "exceptions" part on the test with try, catch, and finally calls. When I try to put the example code into Eclipse I get errors in the catch and throw new areas. All of the errors say "Can not be resolved to type". How do I fix this so I can learn/review what the code is supposed to be doing? Q4 Class public static void main(String [] args) { Q4Exception q1 = new Q4Exception(); try{ q1.sampleMethod(); try{ q1.sampleMethod(); } //This catch does not throw an error

问题 For my final in Java we have a "exceptions" part on the test with try, catch, and finally calls. When I try to put the example code into Eclipse I get errors in the catch and throw new areas. All of the errors say "Can not be resolved to type". How do I fix this so I can learn/review what the code is supposed to be doing? Q4 Class public static void main(String [] args) { Q4Exception q1 = new Q4Exception(); try{ q1.sampleMethod(); try{ q1.sampleMethod(); } //This catch does not throw an error

问题 I'm trying to write an app that works in system tray using PyQt5. The code is sometimes raising exceptions, and I need to be able to catch them. I would expect that when an exception occurs in an app, the main event loop is exited, so catching it like that should work: try: application.exec() except: do_stuff() In the following example, when I press the "Raise" button, I only see the traceback, but I never see the error catched! printed. from PyQt5 import QtWidgets, QtGui, QtCore class

问题 I am using a COM object (MODI) from within my .net application. The method I am calling throws a System.AccessViolationException, which is intercepted by Visual Studio. The odd thing is that I have wrapped my call in a try catch, which has handlers for AccessViolationException, COMException and everything else, but when Visual Studio (2010) intercepts the AccessViolationException, the debugger breaks on the method call (doc.OCR), and if I step through, it continues to the next line instead of

问题 I have a whole sequence of interlinked questions. I would like to know answers for all of them independantly, so *yes*, some of them appear to be X-Y questions; but I do want to know the solution to them anyway!. See end of question for list of other questions in this set. For reasons that aren't relevant to this specific question I've ended up in an event handler, triggered by a catch block in some library code. I want to know why my EventHandler triggered, but I don't seem to get told that

问题 I am using a COM object (MODI) from within my .net application. The method I am calling throws a System.AccessViolationException, which is intercepted by Visual Studio. The odd thing is that I have wrapped my call in a try catch, which has handlers for AccessViolationException, COMException and everything else, but when Visual Studio (2010) intercepts the AccessViolationException, the debugger breaks on the method call (doc.OCR), and if I step through, it continues to the next line instead of

问题 Background This question is related to Why does String.valueOf(null) throw a NullPointerException? Consider the following snippet: public class StringValueOfNull { public static void main(String[] args) { String.valueOf(null); // programmer intention is to invoke valueOf(Object), but instead // code invokes valueOf(char[]) and throws NullPointerException } } As explained in the answer to the linked question, Java's method overloading resolves the above invokation to String.valueOf(char[]),

问题 Background This question is related to Why does String.valueOf(null) throw a NullPointerException? Consider the following snippet: public class StringValueOfNull { public static void main(String[] args) { String.valueOf(null); // programmer intention is to invoke valueOf(Object), but instead // code invokes valueOf(char[]) and throws NullPointerException } } As explained in the answer to the linked question, Java's method overloading resolves the above invokation to String.valueOf(char[]),

问题 Background This question is related to Why does String.valueOf(null) throw a NullPointerException? Consider the following snippet: public class StringValueOfNull { public static void main(String[] args) { String.valueOf(null); // programmer intention is to invoke valueOf(Object), but instead // code invokes valueOf(char[]) and throws NullPointerException } } As explained in the answer to the linked question, Java's method overloading resolves the above invokation to String.valueOf(char[]),