Java joptionpane showinputdialog int calculator


The JOptionPane constructors do not include this argument. Instead, you specify the parent frame when you create the JDialog that contains the JOptionPane , and you use the JDialog setLocationRelativeTo method to set the dialog position.

Show input dialog box - Java Tutorials - Learn Java Online

The other two show Xxx Dialog methods are used less often. The showConfirmDialog method asks the user to confirm something, but presents standard button text (Yes/No or the localized equivalent, for example) rather than button text customized to the user situation (Start/Cancel, for example). A fourth method, showInputDialog , is designed to display a modal dialog that gets a string from the user, using either a text field, an uneditable combo box or a list.

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JOptionPane s icon support lets you easily specify which icon the dialog displays. You can use a custom icon, no icon at all, or any one of four standard JOptionPane icons (question, information, warning, and error). Each look and feel has its own versions of the four standard icons. The following figure shows the icons used in the Java (and Windows) look and feel.

JOptionPane showMessageDialog examples (part 1

Included below are short-answer and programming exercises. Answers are provided for those exercises whose exercise number is a hyperlink. Because college faculty use these exercises in their exams, we have provided answers to roughly half of the exercises included here.

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Modify the program in Fig. to use only integers to calculate the compound interest. ( Hint: Treat all monetary amounts as integral numbers of pennies. Then break the result into its dollar portion and cents portion by using the division and modulus operations, respectively. Insert a period.)

In that example my first argument to the JOptionPane showMessageDialog method is a frame object, which presumably is an instance of a JFrame. If for some reason you don't have a reference to JFrame or JWindow instance, you can make that field null , and still display the identical JOptionPane dialog, as shown in this example:

Write an application that calculates the product of the odd integers from 6 to 65, then displays the results in a message dialog.

Taking this JOptionPane showMessageDialog example to the next level, in a real world application you want to display your message dialog with a title, so next I’ll add a title to the showMessageDialog method. However, adding a title also forces me to add a message type when I call the showMessageDialog method (as you'll see from the general syntax options available, shown later), so in this JOptionPane example I’ll choose the INFORMATION_MESSAGE type:

The arguments to all of the show Xxx Dialog methods and JOptionPane constructors are standardized, though the number of arguments for each method and constructor varies. The following list describes each argument. To see the exact list of arguments for a particular method, see The Dialog API.

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.



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