Java JOptionPane tutorial - Message, input, and confirm dialogs
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JOptionPane can be used to create message, input, and confirm dialogs in Java. Message dialogs display a message using showMessageDialog() with options to set the title, icon, and message type. Input dialogs prompt the user for input using showInputDialog() and return the user's response as a string. Confirm dialogs ask the user to confirm or deny using showConfirmDialog() and return an integer value indicating the user's choice.
Java JOptionPane tutorial - Message, input, and confirm dialogs
- 1. <1> ♋ Bero JOptionPane Message, input, and confirm dialogs
- 2. <2> ♋ Bero JOptionPane can be used to create different types of dialogs: Firstly… import javax.swing.JOptionPane; JOptionPane Message dialog Input dialog Confirm dialog
- 3. <3> ♋ Bero 1) Message dialogs: There are several overloaded versions of showMessageDialog( ) 1.1) JOptionPane.showMessageDialog(Component, Message); Example: JOptionPane.showMessageDialog(null, “Hello world”); 1.2) JOptionPane.showMessageDialog(Component, Message, Title, MessageType); Example: JOptionPane.showMessageDialog(null, “Hello world”, “My Message”, JOptionPane.PLAIN_MESSAGE); The graphical component in which the message dialog will be displayed within. The message that will be displayed. Null indicates message will appear in the centre of the screen. A string representing the title of the message. The icon of the message changes according to type passed.
- 4. <4> ♋ Bero Message icon Types: Example: JOptionPane.showMessageDialog(null, “Hello world”, “My Message”, JOptionPane.WARNING_MESSAGE); The numeric value of the icon can be passed as a parameter as well. Example: JOptionPane.showMessageDialog(null, “Hello world”, “My Message”, 0);
- 5. <5> ♋ Bero 2) Input dialogs: - Overloaded forms of showInputDialog( ): 2.1) String x = JOptionPane.showInputDialog(“prompt message”); Example: String x = JOptionPane.showInputDialog(“Enter a value: ”); 2.2) String x = JOptionPane.showInputDialog(“message”, InitialValue); Example: String x = JOptionPane.showInputDialog(“Enter a value: ”, 0); 2.3) String x = JOptionPane.showInputDialog(Component, “message”, “Title”, IconType); Example: String x = JOptionPane.showInputDialog(null, “Enter a value: ”, “Input value”, 1); A variable of type string to hold the value entered by the user. Message that will appear on the dialog.
- 6. <6> ♋ Bero 3) Confirm dialogs: - Overloaded forms of showConfirmDialog( ): 3.1) int y = JOptionPane.showConfirmDialog(Component, “Message”); Example: int y = JOptionPane.showConfirmDialog(null, “Are you sure?”); 3.2) int y = JOptionPane.showConfirmDialog(Component, “Message”, “Title”, OptionType); Example: int y = JOptionPane.showConfirmDialog(null, “Are you sure?”, “Confirm”, JOptionPane.YES_NO_OPTION); Holds a value depending on the user’s choice (yes (0), no (1), or cancel (2)). Buttons appearing on dialog: - YES_NO_CANCEL_OPTION - YES_NO_OPTION - YES_OPTION