使用偏好
Preferences
可用于存储反映用户个人应用程序设置的用户设置,例如他们的编辑器字体,是否更喜欢以全屏模式启动应用程序,是否选中不再显示此项复选框和事物像那样。
public class ExitConfirmer {
private static boolean confirmExit() {
Preferences preferences = Preferences.userNodeForPackage(ExitConfirmer.class);
boolean doShowDialog = preferences.getBoolean("showExitConfirmation", true); // true is default value
if (!doShowDialog) {
return true;
}
//
// Show a dialog here...
//
boolean exitWasConfirmed = ...; // whether the user clicked OK or Cancel
boolean doNotShowAgain = ...; // get value from "Do not show again" checkbox
if (exitWasConfirmed && doNotShowAgain) {
// Exit was confirmed and the user chose that the dialog should not be shown again
// Save these settings to the Preferences object so the dialog will not show again next time
preferences.putBoolean("showExitConfirmation", false);
}
return exitWasConfirmed;
}
public static void exit() {
if (confirmExit()) {
System.exit(0);
}
}
}