51 questions
This is one of the typical questions that is frequently asked in hashcodeYou have created a new activity using the wizard according to the tutorial. NullPointerException occurred when a method call wa...
Hello, everyone I'm a beginner developer.I'm asking you this question because there's no way to find it during the development of the program.Java development is currently springing.When the controlle...
What is NullPointerException (java.lang.NullPointerException) and why does it occur?Is there any method that can be used to prevent a program from terminating abnormally due to NullPointerException?
I use HttpURLConnection to access http link to download files from Android. Logcat displays this error WARN/System.err(223): java.net.SocketException: Permission denied (maybe missing INTERNET permiss...
We need to do a unit test for the exceptionIs there a way to deliberately cause specific exceptions such as EOFError and ZeroDivisionError?
URL url = new URL(urlToRssFeed);SAXParserFactory factory = SAXParserFactory.newInstance();SAXParser parser = factory.newSAXParser();XMLReader xmlreader = parser.getXMLReader();RssHandler theRSSHandler...
You are about to create an exception handling class. public class MyException extends Exception {}public class Foo { public bar() throws MyException { throw new MyException(try again please); }}I trie...
Hello, I am a student studying web programming.These days, I am studying jstl and el in JSP.I am using IntelliJ IDEA as IDE.When I first created the web application project, I just copied ojdbc14.jar ...
I want to do the same thing for err1 and err2Do I have to write it separately like that?try: # Error Codeexcept err1 : passexcept err2 : pass
import java.util.*;//lotto numberpublic class Pre4 {public static void main(String[] args){ Random rann = new Random(); int[] a = new int[45]; int[] b = new int[7]; for(int q=0;q<a.length;q++){ a[...
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