Create An Error Message In Java
Contents |
JComponent Class Using Text Components Text Component Features The Text Component API How to Use Various Components How to Make Applets How to Use Buttons, Check Boxes, and Radio Buttons How to Use the ButtonGroup Component How to
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Use Color Choosers How to Use Combo Boxes How to Make Dialogs How to java error messages and solutions Use Editor Panes and Text Panes How to Use File Choosers How to Use Formatted Text Fields How to Make Frames
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(Main Windows) How to Use Internal Frames How to Use Labels How to Use Layered Panes How to Use Lists How to Use Menus How to Use Panels How to Use Password Fields How to java error messages best practices Use Progress Bars How to Use Root Panes How to Use Scroll Panes How to Use Separators How to Use Sliders How to Use Spinners How to Use Split Panes How to Use Tabbed Panes How to Use Tables How to Use Text Areas How to Use Text Fields How to Use Tool Bars How to Use Tool Tips How to Use Trees How to Use HTML in Swing Components creating soap message in java How to Use Models How to Use Icons How to Use Borders Solving Common Component Problems Trail: Creating a GUI With JFC/Swing Lesson: Using Swing Components Section: How to Use Various Components Home Page > Creating a GUI With JFC/Swing > Using Swing Components «Previous•Trail•Next» How to Make Dialogs A Dialog window is an independent subwindow meant to carry temporary notice apart from the main Swing Application Window. Most Dialogs present an error message or warning to a user, but Dialogs can present images, directory trees, or just about anything compatible with the main Swing Application that manages them. For convenience, several Swing component classes can directly instantiate and display dialogs. To create simple, standard dialogs, you use the JOptionPane class. The ProgressMonitor class can put up a dialog that shows the progress of an operation. Two other classes, JColorChooser and JFileChooser, also supply standard dialogs. To bring up a print dialog, you can use the Printing API. To create a custom dialog, use the JDialog class directly. The code for simple dialogs can be minimal. For example, here is an informational dialog: Here is the code that creates and shows it: JOptionPane.showMessageDialog(frame, "Eggs are not supposed to be green."); The rest of this section covers the following top
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;
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public class ErrorDialog { public static void main(String flash error messages argv[]) { String message = "\"The Comedy of Errors\"\n" + "is
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considered by many scholars to be\n" + "the first play Shakespeare wrote"; JOptionPane.showMessageDialog(new JFrame(), message, "Dialog", JOptionPane.ERROR_MESSAGE); } } Related https://docs.oracle.com/javase/tutorial/uiswing/components/dialog.html 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 http://www.java2s.com/Code/Java/Swing-JFC/Errormessagedialog.htm 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.
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 http://www.homeandlearn.co.uk/java/java_error_handling.html error will prevent the program from running, NetBeans 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. But first a word on how Java handles error message 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 try catch block means "try this code". If something goes wrong, java error messages 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 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