Creating Error Messages Java
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Java Error Messages List
only takes a minute: Sign up Java. How to make an error message for when userInput is a string instead of an int? up vote 0 down vote favorite I'm working on a sort of test in Java, in which the user is given a question like this: " 4 + ? = 12". The numbers are randomised and so
Java Error Messages Best Practices
is the questionsmark. I need to make an error message for when the user input isn't an int. For example if the user types in the word "eight" instead of "8" an error message will show up. How can I do this? java user-input share|improve this question edited Feb 14 at 4:03 Joel Coehoorn 248k92440661 asked Sep 6 '14 at 12:22 Mikaela 912 3 Have you read about exception handling? –PakkuDon Sep 6 '14 at 12:23 2 You could try to convert the string response to an integer and catch the exception if the conversion fails (using a try ... catch block –ErstwhileIII Sep 6 '14 at 12:23 We can't do anything but guess without much more data. Are you making a GUI? Are you making a command-line program? –bmargulies Sep 6 '14 at 13:43 add a comment| 3 Answers 3 active oldest votes up vote 2 down vote Scanner scanner = new Scanner(System.in); String input = scanner.nextLine();//get the next input line scanner.close(); Integer value = null; try { value = Integer.valueOf(input); //if value cann
can be broken up into two categories: Design-time errors and Logical errors. Design-time errors are easy to spot because NetBeans usually underlines them. If the error will prevent the program from running, NetBeans creating error messages in excel will underline it in red. Logical errors are the ones that you make as a
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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 java custom error see examples of run-time errors shortly. You'll also see how to handle them. 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, http://stackoverflow.com/questions/25700196/java-how-to-make-an-error-message-for-when-userinput-is-a-string-instead-of-an 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 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 http://www.homeandlearn.co.uk/java/java_error_handling.html 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 you are using comes first. In this case we are using the Exception error object. This is a "catch all" type of Exception, and not very good programming practice. We'll change it to a specific type in a moment. After your Exception type you have a space then a variable name. We've called ours err, but you can it almost anything you like. In the curly brackets of catch we have a print statement. But look
LDAPJPAJSPJSTLLanguage BasicsNetwork ProtocolPDF RTFReflectionRegular ExpressionsScriptingSecurityServletsSpringSwing ComponentsSwing JFCSWT JFace EclipseThreadsTiny ApplicationVelocityWeb Services SOAXMLError message dialog : Dialog«Swing JFC«JavaJavaSwing JFCDialogError message dialog import javax.swing.JFrame; import javax.swing.JOptionPane; http://www.java2s.com/Code/Java/Swing-JFC/Errormessagedialog.htm public class ErrorDialog { public static void main(String argv[]) { String message = "\"The Comedy of Errors\"\n" + "is http://www.javaworld.com/javaworld/jw-12-2001/jw-1221-exceptions.html considered by many scholars to be\n" + "the first play Shakespeare wrote"; JOptionPane.showMessageDialog(new JFrame(), message, "Dialog", JOptionPane.ERROR_MESSAGE); } } Related error messages examples in the same category1.Creating and using Dialog Boxes2.Dialog boxes and creating your own components3.A frame that can easily support internal frame dialogs4.An example of using the JOptionPane with a custom list of options in an5.See the differences between java error messages various types of option panes6.Vote Dialog7.Create simple about dialog8.Dialog separator9.Message dialog10.Information dialog with customized logo11.Input dialog with user-defined logo12.Confirmation dialog13.Default button for dialog: press Enter to activate14.Simple dialog for asking a yes no question15.Class to Prompt the User for an ID and Password16.Simple Save Dialog demo17.Demonstrate JOptionPane18.Create Color Sample Popup19.Simple Input Dialog20.No button dialog21.Message Dialog demo 22.Escape Key close Dialog23.Dialog can be closed by pressing the escape key24.Dialog which displays indeterminate progress25.Dialog with Escape Key26.Modal Message Dialog27.A frame with a menu whose File->Connect action shows a password dialog28.A sample modal dialog that displays a message and waits for the user to click the Ok buttonjava2s.com |Email:info at java2s.com|© Demo Source and Support. All rights reserved.
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 message text to differentiate between two different exceptions. The message text assoc