Java Foundation Classes in a Nutshell

that asks a question with a confirm dialog (note the use of a string array for the

message argument):

int response = JOptionPane.showConfirmDialog(mainpanel, new String[] {

/* first line of the message */ "There are unsaved files.",

/* second line of message */ "Save them before quitting?"},

/* dialog title */ "Save Before Quitting?",

/* what buttons to display */ JOptionPane.YES_NO_CANCEL_OPTION,

/* icon type to display */ JOptionPane.WARNING_MESSAGE);

switch(response) {

case JOptionPane.YES_OPTION: saveAndQuit();

case JOptionPane.NO_OPTION: quitWithoutSaving();

case JOptionPane.CANCEL_OPTION:

case JOptionPane.CLOSED_OPTION: break; // Don't quit!

}

Input Dialogs

The showInputDialog() and showInternalInputDialog() methods are designed to

ask for input that is more complex than a yes-or-no answer. The simple versions

of

showInputDialog() support asking a question like “What is your name?” and

letting the user type a response in a text input area:

String name = JOptionPane.showInputDialog(frame, "What is your name?");

The more complex version of this method allows the user to select an object from

a list or pull-down menu of predefined options.

The arguments to

showInputDialog() ar e quite similar to those passed to showMes-

sageDialog() and showConfirmDialog().Todisplay a list of options to the user,

use the seven-argument version of the method and pass in an array of choices and

the default choice to ...