Creating Error Messages In Java
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Java Runtime Error Messages
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Java Error Messages And Solutions
is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Java: custom-exception-error up vote 2 down vote favorite $ javac TestExceptions.java TestExceptions.java:11: cannot
Java Error Messages List
find symbol symbol : class test location: class TestExceptions throw new TestExceptions.test("If you see me, exceptions work!"); ^ 1 error Code import java.util.*; import java.io.*; public class TestExceptions { static void test(String message) throws java.lang.Error{ System.out.println(message); } public static void main(String[] args){ try { // Why does it not access TestExceptions.test-method in the class? throw new TestExceptions.test("If you see me, exceptions work!"); }catch(java.lang.Error a){ System.out.println("Working Status: " + a.getMessage() java error messages best practices ); } } } java error-handling custom-errors share|improve this question asked Apr 13 '10 at 16:35 hhh 13.5k2994173 add a comment| 2 Answers 2 active oldest votes up vote 2 down vote accepted Working Code Try this: public class TestExceptions extends Exception { public TestExceptions( String s ) { super(s); } public static void main(String[] args) throws TestExceptions{ try { throw new TestExceptions("If you see me, exceptions work!"); } catch( Exception a ) { System.out.println("Working Status: " + a.getMessage() ); } } } Problems There are a number of issues with the code you posted, including: Catching Error instead of Exception Using a static method to construct the exception Not extending Exception for your exception Not calling the superclass constructor of Exception with the message The posted code resolves those issues and displays what you were expecting. share|improve this answer edited Aug 11 at 15:42 Community♦ 11 answered Apr 13 '10 at 16:38 Dave Jarvis 16.4k24105204 add a comment| up vote 2 down vote TestExceptions.test returns type void, so you cannot throw it. For this to work, it needs to return an object of a type that extends Throwable. One example might be: static Exception test(String message) { return new Exception(message); } However, this isn't very cle
LDAPJPAJSPJSTLLanguage BasicsNetwork ProtocolPDF RTFReflectionRegular ExpressionsScriptingSecurityServletsSpringSwing ComponentsSwing JFCSWT JFace EclipseThreadsTiny ApplicationVelocityWeb Services SOAXMLDisplay error message dialog with JOptionPane.ERROR_MESSAGE creating error messages in excel : OptionPane«Swing JFC«JavaJavaSwing JFCOptionPaneDisplay error message java custom error dialog with JOptionPane.ERROR_MESSAGE import javax.swing.JOptionPane; import javax.swing.JPanel; public class JOptionPaneERROR_MESSAGE java custom error handling { public static void main(String[] args) { final JPanel panel = new JPanel(); JOptionPane.showMessageDialog(panel, "Could not http://stackoverflow.com/questions/2631345/java-custom-exception-error open file", "Error", JOptionPane.ERROR_MESSAGE); } } Related examples in the same category1.A Program that Uses the JOptionPane Class to Get User Input2.Demonstrates JoptionPane3.OptionPane Sample: simple dialog4.JOptionPane demo5.JOptionPane utilities6.Simple Input Dialog7.Demonstrate JOptionPane8.Display warning http://www.java2s.com/Code/Java/Swing-JFC/DisplayerrormessagedialogwithJOptionPaneERRORMESSAGE.htm message dialog with JOptionPane.WARNING_MESSAGE9.Display question message dialog with JOptionPane.QUESTION_MESSAGE10.Display information message dialog with JOptionPane.INFORMATION_MESSAGE11.Show a message dialog with JOptionPane12.Create a message dialog box with different options13.Show message in two lines in a dialog box14.Modal dialog with yes/no button15.Modal dialog with OK/cancel and a text field16.Wait (forever) for a non-null click and then quit17.Create a Confirm Dialog Box18.Create a Message Dialog Box19.Use a JOptionPane20.Yes no cancel dialog21.OK cancel option dialog22.Dialog with default options23.Localize a JOptionPane dialog24.Customize JOptionPane buttons25.Exercise Options26.Modifiable JOptionPane27.Message dialog helper28.Exercise all JOptionPane based dialogsjava2s.com |Email:info at java2s.com|© Demo Source and Support. All rights reserved.
can be broken up into two categories: Design-time errors and Logical errors. Design-time errors are easy to spot because NetBeans usually http://www.homeandlearn.co.uk/java/java_error_handling.html underlines them. If the error will prevent the program from running, NetBeans http://www.javaworld.com/javaworld/jw-12-2001/jw-1221-exceptions.html will underline it in red. Logical errors are the ones that you make as a programmer. The program will run but, because you did something wrong with the coding, there's a good chance the entire thing will crash. You'll see examples of run-time errors shortly. You'll also see how to handle them. error messages But first a word on how Java handles errors. Exceptions In Java, errors are handled by an Exception object. Exceptions are said to be thrown, and it's your job to catch them. You can do this with a try catch block. The try catch block looks like this: try { } catch ( ExceptionType error_variable ) { } The try part of the java error messages try catch block means "try this code". If something goes wrong, Java will jump to the catch block. It checks what you have between the round brackets to see if you have handled the error. If you have the correct Exception type then whatever code you have between the curly brackets of catch will get executed. If you don't have the correct Exception type then Java will use its default exception handler to display an error message. As an example, create a new console application. Call it anything you like. In the code for the Main method, enter the following: try { int x = 10; int y = 0; int z = x / y; System.out.println( z ); } catch ( Exception err ) { System.out.println( err.getMessage( ) ); } In the try part of the try catch block, we have set up three integers, x, y and z. We are trying to divide y into x, and then print out the answer. If anything goes wrong, we have a catch part. In between the round brackets of catch we have this: Exception err The type of Exception y
Learning soars 7 habits of highly effective developers 10 hard-core coding tips for faster Python Beyond jQuery: An expert guide to choosing the right JavaScript framework More Insider Sign Out Search for Suggestions for you Insider email Core Java All Core Java Agile Development Java Concurrency Java Language Java Platform Java Security Programming Careers Testing and Debugging Enterprise Java All Enterprise Java Big Data Cloud Computing Data Analytics Development Tools Java APIs Java App Dev Java Web Development Open Source Scripting and JVM Languages Learn Java All Learn Java Design Patterns Mobile Java All Mobile Java Java Android Developers Java iOS Developers News Features How-Tos Blogs Resources/White Papers Newsletters × Close Home Testing and Debugging News Exceptional practices, Part 3 More like this Exceptional practices, Part 2 Exceptional practices, Part 1 Log it or lose it Use message catalogs for easy localization Email a friend To Use commas to separate multiple email addresses From Privacy Policy Thank you Your message has been sent. Sorry There was an error emailing this page. Comments By Brian Goetz JavaWorld | Dec 21, 2001 12:00 AM PT RELATED TOPICS Testing and Debugging Java Security Java Language Comments In Parts 1 and 2 of this series, I explored several ways in which exceptions could be used more effectively to deliver error-recovery information to the parties that need it -- other Java classes, developers, and users. In Part 3, I look at the oft-ignored problem of internationalization and a technique for simplifying internationalization: the use of message catalogs for storing message text.Read the whole series on exception handling:Part 1: Use exceptions effectively in your programsPart 2: Use exception chaining to preserve debugging informationPart 3: Use message catalogs for easy localizationPart 1 emphasized that if two different exceptions could potentially have different error-recovery procedures, then they should be of different classes -- although perhaps derived from the same base class. You never want to be in the situation where you will be tempted to use the mes